diff --git a/FrOSCon26/FrOSCon.26.mm b/FrOSCon26/FrOSCon.26.mm
index 0f6b63e..90f88e7 100644
--- a/FrOSCon26/FrOSCon.26.mm
+++ b/FrOSCon26/FrOSCon.26.mm
@@ -1162,9 +1162,9 @@
 </node>
 </node>
 <node CREATED="1786299650606" ID="ID_1358348030" MODIFIED="1786299654447" TEXT="state definition">
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1786506976676" ID="ID_305985132" MODIFIED="1786656379912" TEXT="use of state per slot...">
+<node COLOR="#338800" CREATED="1786506976676" ID="ID_305985132" MODIFIED="1786660990622" TEXT="use of state per slot...">
 <arrowlink COLOR="#627a97" DESTINATION="ID_1806019726" ENDARROW="Default" ENDINCLINATION="844;-50;" ID="Arrow_ID_1270577683" STARTARROW="None" STARTINCLINATION="506;72;"/>
-<icon BUILTIN="flag-yellow"/>
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 <node CREATED="1786329171661" ID="ID_652095992" MODIFIED="1786329177583" TEXT="cursor nextShow_">
@@ -1307,9 +1307,9 @@
 </node>
 <node COLOR="#006699" CREATED="1786245367557" ID="ID_1248853430" MODIFIED="1786643762078" TEXT="Animation, die schreib- und Leseoperationen zeigt..."/>
 </node>
-<node BACKGROUND_COLOR="#d2beaf" COLOR="#5c4d6e" CREATED="1785877291601" ID="ID_517600933" MODIFIED="1786466625791" TEXT="Diagramm &quot;State-Ring&quot;">
+<node COLOR="#338800" CREATED="1785877291601" ID="ID_517600933" MODIFIED="1786660999055" TEXT="Diagramm &quot;State-Ring&quot;">
 <linktarget COLOR="#c23657" DESTINATION="ID_517600933" ENDARROW="Default" ENDINCLINATION="134;15;" ID="Arrow_ID_670746681" SOURCE="ID_270282240" STARTARROW="None" STARTINCLINATION="23;-122;"/>
-<icon BUILTIN="hourglass"/>
+<icon BUILTIN="button_ok"/>
 <node BACKGROUND_COLOR="#accdc3" COLOR="#3f4015" CREATED="1785877302464" ID="ID_1725774104" MODIFIED="1785880120631" STYLE="fork" TEXT="Ein Schema ist nebenbei im Chat mit Claude &quot;angefallen&quot;">
 <edge COLOR="#808080" STYLE="bezier" WIDTH="thin"/>
 <arrowlink COLOR="#339dbd" DESTINATION="ID_1806019726" ENDARROW="Default" ENDINCLINATION="121;0;" ID="Arrow_ID_938057656" STARTARROW="None" STARTINCLINATION="-30;41;"/>
@@ -1318,15 +1318,20 @@
 <node CREATED="1785877324133" ID="ID_578045214" MODIFIED="1785877342463" TEXT="hatte ihn das in Graphviz definieren und nach SVG rendern lassen">
 <icon BUILTIN="idea"/>
 </node>
-<node BACKGROUND_COLOR="#f0d5c5" COLOR="#990033" CREATED="1785877343638" ID="ID_801220717" MODIFIED="1785877347896" TEXT="brauchbar?">
+<node COLOR="#006699" CREATED="1785877343638" ID="ID_801220717" MODIFIED="1786661002146" TEXT="brauchbar?">
 <icon BUILTIN="help"/>
+<node CREATED="1786661006589" ID="ID_1093573746" MODIFIED="1786661048132" TEXT="ja: habs vor dem State-Ring eingebaut"/>
+<node CREATED="1786661020642" ID="ID_1076990072" MODIFIED="1786661039901" TEXT="sogar sehr wichtig, man mu&#xdf; die State-Engine wenigstenseinmal sehen"/>
+<node COLOR="#338800" CREATED="1786661049458" ID="ID_1526572846" MODIFIED="1786661056718" TEXT="hab das Layout umgestellt">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1785880050158" ID="ID_1806019726" MODIFIED="1786656371060" TEXT="Diagramm &quot;State-Engine&quot;">
+</node>
+<node COLOR="#338800" CREATED="1785880050158" ID="ID_1806019726" MODIFIED="1786660987043" TEXT="Diagramm &quot;State-Engine&quot;">
 <linktarget COLOR="#339dbd" DESTINATION="ID_1806019726" ENDARROW="Default" ENDINCLINATION="121;0;" ID="Arrow_ID_938057656" SOURCE="ID_1725774104" STARTARROW="None" STARTINCLINATION="-30;41;"/>
 <linktarget COLOR="#627a97" DESTINATION="ID_1806019726" ENDARROW="Default" ENDINCLINATION="844;-50;" ID="Arrow_ID_1270577683" SOURCE="ID_305985132" STARTARROW="None" STARTINCLINATION="506;72;"/>
-<icon BUILTIN="flag-yellow"/>
+<icon BUILTIN="button_ok"/>
 <node CREATED="1786656669970" HGAP="36" ID="ID_817187689" MODIFIED="1786656686513" TEXT="Diagramm: Beschriftungen vereinfachen..." VSHIFT="9"/>
 </node>
 <node COLOR="#338800" CREATED="1785880050158" ID="ID_1123988986" MODIFIED="1786640284601" TEXT="Diagramm &quot;Thread-handoff&quot;">
diff --git a/FrOSCon26/Talk-IOUring.odp b/FrOSCon26/Talk-IOUring.odp
index 3b70f8a..7b56ab5 100644
Binary files a/FrOSCon26/Talk-IOUring.odp and b/FrOSCon26/Talk-IOUring.odp differ
diff --git a/FrOSCon26/drawings/ring-buffer.svg b/FrOSCon26/drawings/ring-buffer.svg
index 305f285..f2fcb93 100644
--- a/FrOSCon26/drawings/ring-buffer.svg
+++ b/FrOSCon26/drawings/ring-buffer.svg
@@ -1,4 +1,44 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 620 560" font-family="sans-serif">
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 999.99987 829.218"
+   font-family="sans-serif"
+   version="1.1"
+   id="svg30"
+   sodipodi:docname="ring-buffer.svg"
+   inkscape:version="1.4.3 (0d15f75042, 2025-12-25)"
+   inkscape:export-filename="../state-ring.svg"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   width="14.58cm"
+   height="12.09cm"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
+  <title
+     id="title30">State progression in the Ringbuffer</title>
+  <sodipodi:namedview
+     id="namedview30"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="1.5339286"
+     inkscape:cx="293.03841"
+     inkscape:cy="227.84633"
+     inkscape:window-width="1920"
+     inkscape:window-height="1057"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg30"
+     inkscape:document-units="cm" />
   <!--
     Ring-buffer snapshot for the io_uring video demo.
     A fixed array of RING_SIZ buffers is used cyclically: slot = frameNr % RING_SIZ.
@@ -7,105 +47,752 @@
       nextShow_ (consumption) rests on the slot currently shown, advancing on release
     This is an illustrative snapshot (START_FRAME = 40, RING_SIZ = 5).
   -->
-  <defs>
-    <marker id="arrow" markerWidth="9" markerHeight="9" refX="7" refY="4.5"
-            orient="auto" markerUnits="userSpaceOnUse">
-      <path d="M0,0 L9,4.5 L0,9 Z" fill="#333"/>
+  <defs
+     id="defs2">
+    <marker
+       id="arrow"
+       markerWidth="9"
+       markerHeight="9"
+       refX="7"
+       refY="4.5"
+       orient="auto"
+       markerUnits="userSpaceOnUse">
+      <path
+         d="M 0,0 9,4.5 0,9 Z"
+         fill="#333333"
+         id="path1" />
     </marker>
-    <marker id="arrowRot" markerWidth="10" markerHeight="10" refX="6" refY="5"
-            orient="auto" markerUnits="userSpaceOnUse">
-      <path d="M0,0 L10,5 L0,10 Z" fill="#888"/>
+    <marker
+       id="arrowRot"
+       markerWidth="10"
+       markerHeight="10"
+       refX="6"
+       refY="5"
+       orient="auto"
+       markerUnits="userSpaceOnUse">
+      <path
+         d="M 0,0 10,5 0,10 Z"
+         fill="#888888"
+         id="path2" />
     </marker>
   </defs>
-
-  <text x="310" y="34" text-anchor="middle" font-size="18" font-weight="bold">
-    Buffers used as a ring:  slot = frameNr % RING_SIZ
-  </text>
-
   <!-- rotation hint (clockwise) -->
-  <path d="M 395 138 A 130 130 0 0 1 452 300" fill="none" stroke="#bbb"
-        stroke-width="2" stroke-dasharray="4 5" marker-end="url(#arrowRot)"/>
-  <text x="470" y="320" font-size="12" fill="#999">advances</text>
-
   <!-- ===================== slots ===================== -->
   <!-- slot 0 : SHOW  (frame 40, currently lent to GUI) -->
-  <g>
-    <circle cx="310" cy="120" r="46" fill="#e7d8ff" stroke="#5a2ca0" stroke-width="2.2"/>
-    <text x="310" y="112" text-anchor="middle" font-size="14" font-weight="bold">SHOW</text>
-    <text x="310" y="132" text-anchor="middle" font-size="12" fill="#444">frame 40</text>
-    <text x="372" y="104" text-anchor="middle" font-size="11" fill="#888">slot 0</text>
-  </g>
   <!-- slot 1 : FEED  (frame 41, ready to show) -->
-  <g>
-    <circle cx="452" cy="203" r="46" fill="#d8f0d8" stroke="#3a7a3a" stroke-width="2.2"/>
-    <text x="452" y="199" text-anchor="middle" font-size="14" font-weight="bold">FEED</text>
-    <text x="452" y="219" text-anchor="middle" font-size="12" fill="#444">frame 41</text>
-    <text x="507" y="200" text-anchor="middle" font-size="11" fill="#888">slot 1</text>
-  </g>
   <!-- slot 2 : READ  (frame 42, IO in flight) -->
-  <g>
-    <circle cx="398" cy="371" r="46" fill="#ffedcc" stroke="#b8860b" stroke-width="2.2"/>
-    <text x="398" y="367" text-anchor="middle" font-size="14" font-weight="bold">READ</text>
-    <text x="398" y="387" text-anchor="middle" font-size="12" fill="#444">frame 42</text>
-    <text x="398" y="432" text-anchor="middle" font-size="11" fill="#888">slot 2</text>
-  </g>
   <!-- slot 3 : READ  (frame 43, IO in flight) -->
-  <g>
-    <circle cx="222" cy="371" r="46" fill="#ffedcc" stroke="#b8860b" stroke-width="2.2"/>
-    <text x="222" y="367" text-anchor="middle" font-size="14" font-weight="bold">READ</text>
-    <text x="222" y="387" text-anchor="middle" font-size="12" fill="#444">frame 43</text>
-    <text x="222" y="432" text-anchor="middle" font-size="11" fill="#888">slot 3</text>
-  </g>
   <!-- slot 4 : FREE  (next to be submitted) -->
-  <g>
-    <circle cx="168" cy="203" r="46" fill="#dbe9ff" stroke="#3a5a8a" stroke-width="2.2"/>
-    <text x="168" y="199" text-anchor="middle" font-size="14" font-weight="bold">FREE</text>
-    <text x="168" y="219" text-anchor="middle" font-size="12" fill="#444">—</text>
-    <text x="113" y="200" text-anchor="middle" font-size="11" fill="#888">slot 4</text>
-  </g>
-
   <!-- center caption -->
-  <text x="310" y="258" text-anchor="middle" font-size="13" fill="#666">buffer_[ ]</text>
-  <text x="310" y="277" text-anchor="middle" font-size="11" fill="#999">RING_SIZ = 5</text>
-
   <!-- ===================== cursors ===================== -->
   <!-- nextShow_ -> slot 0 -->
-  <g>
-    <rect x="150" y="52" width="150" height="26" rx="5" fill="#f3ecff" stroke="#5a2ca0"/>
-    <text x="225" y="70" text-anchor="middle" font-size="13" fill="#5a2ca0">
-      nextShow_ = 40
-    </text>
-    <path d="M 278 72 C 300 84, 300 74, 300 96" fill="none" stroke="#5a2ca0"
-          stroke-width="2" marker-end="url(#arrow)"/>
-  </g>
   <!-- nextRead_ -> slot 4 -->
-  <g>
-    <rect x="18" y="120" width="150" height="26" rx="5" fill="#eaf1fb" stroke="#3a5a8a"/>
-    <text x="93" y="138" text-anchor="middle" font-size="13" fill="#3a5a8a">
-      nextRead_ = 44
-    </text>
-    <path d="M 110 146 C 120 168, 138 168, 150 182" fill="none" stroke="#3a5a8a"
-          stroke-width="2" marker-end="url(#arrow)"/>
-  </g>
-
   <!-- ===================== legend ===================== -->
-  <g font-size="12" transform="translate(40,478)">
-    <text x="0" y="0" font-weight="bold" font-size="13">States:</text>
-    <rect x="66"  y="-11" width="15" height="15" rx="3" fill="#dbe9ff" stroke="#3a5a8a"/>
-    <text x="86"  y="1">FREE</text>
-    <rect x="140" y="-11" width="15" height="15" rx="3" fill="#ffedcc" stroke="#b8860b"/>
-    <text x="160" y="1">READ</text>
-    <rect x="216" y="-11" width="15" height="15" rx="3" fill="#d8f0d8" stroke="#3a7a3a"/>
-    <text x="236" y="1">FEED</text>
-    <rect x="292" y="-11" width="15" height="15" rx="3" fill="#e7d8ff" stroke="#5a2ca0"/>
-    <text x="312" y="1">SHOW</text>
-    <rect x="372" y="-11" width="15" height="15" rx="3" fill="#ffd6d6" stroke="#a00000"/>
-    <text x="392" y="1">STOP</text>
+  <metadata
+     id="metadata30">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <cc:license
+           rdf:resource="http://creativecommons.org/licenses/by-sa/4.0/" />
+        <dc:title>State progression in the Ringbuffer</dc:title>
+      </cc:Work>
+      <cc:License
+         rdf:about="http://creativecommons.org/licenses/by-sa/4.0/">
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Reproduction" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Distribution" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Notice" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Attribution" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#DerivativeWorks" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#ShareAlike" />
+      </cc:License>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="drawing">
+    <path
+       d="M 715.0571,172.11989 A 235.02157,235.05218 0 0 1 818.10502,465.03107"
+       fill="none"
+       stroke="#bbbbbb"
+       stroke-width="2"
+       stroke-dasharray="4, 5"
+       marker-end="url(#arrowRot)"
+       id="path3" />
+    <text
+       x="850.70184"
+       y="501.16031"
+       font-size="21.6957px"
+       fill="#999999"
+       id="text3"
+       style="stroke-width:1"
+       transform="scale(0.99993487,1.0000651)">advances</text>
+    <g
+       id="g6"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <circle
+         cx="310"
+         cy="120"
+         r="46"
+         fill="#e7d8ff"
+         stroke="#5a2ca0"
+         stroke-width="1.21683"
+         id="circle3" />
+      <text
+         x="310"
+         y="112"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text4"
+         style="stroke-width:0.553105">SHOW</text>
+      <text
+         x="310"
+         y="132"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text5"
+         style="stroke-width:0.553105">frame 40</text>
+      <text
+         x="381.12689"
+         y="104.65192"
+         text-anchor="middle"
+         font-size="11"
+         fill="#888888"
+         id="text6"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 0</text>
+    </g>
+    <g
+       id="g9"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <circle
+         cx="452"
+         cy="203"
+         r="46"
+         fill="#d8f0d8"
+         stroke="#3a7a3a"
+         stroke-width="1.21683"
+         id="circle6" />
+      <text
+         x="452"
+         y="199"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text7"
+         style="stroke-width:0.553105">FEED</text>
+      <text
+         x="452"
+         y="219"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text8"
+         style="stroke-width:0.553105">frame 41</text>
+      <text
+         x="524.60187"
+         y="200"
+         text-anchor="middle"
+         font-size="11px"
+         fill="#888888"
+         id="text9"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 1</text>
+    </g>
+    <g
+       id="g12"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <circle
+         cx="398"
+         cy="371"
+         r="46"
+         fill="#ffedcc"
+         stroke="#b8860b"
+         stroke-width="1.21683"
+         id="circle9" />
+      <text
+         x="398"
+         y="367"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text10"
+         style="stroke-width:0.553105">READ</text>
+      <text
+         x="398"
+         y="387"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text11"
+         style="stroke-width:0.553105">frame 42</text>
+      <text
+         x="398.65192"
+         y="439.17114"
+         text-anchor="middle"
+         font-size="11"
+         fill="#888888"
+         id="text12"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 2</text>
+    </g>
+    <g
+       id="g15"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <circle
+         cx="222"
+         cy="371"
+         r="46"
+         fill="#ffedcc"
+         stroke="#b8860b"
+         stroke-width="1.21683"
+         id="circle12" />
+      <text
+         x="222"
+         y="367"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text13"
+         style="stroke-width:0.553105">READ</text>
+      <text
+         x="222"
+         y="387"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text14"
+         style="stroke-width:0.553105">frame 43</text>
+      <text
+         x="222.65192"
+         y="439.17114"
+         text-anchor="middle"
+         font-size="11"
+         fill="#888888"
+         id="text15"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 3</text>
+    </g>
+    <g
+       id="g18"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <circle
+         cx="168"
+         cy="203"
+         r="46"
+         fill="#dbe9ff"
+         stroke="#3a5a8a"
+         stroke-width="1.21683"
+         id="circle15" />
+      <text
+         x="168"
+         y="199"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text16"
+         style="stroke-width:0.553105">FREE</text>
+      <text
+         x="168"
+         y="219"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text17"
+         style="stroke-width:0.553105">—</text>
+      <text
+         x="90.182777"
+         y="198.69617"
+         text-anchor="middle"
+         font-size="11px"
+         fill="#888888"
+         id="text18"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 4</text>
+    </g>
+    <text
+       x="561.42572"
+       y="423.41733"
+       text-anchor="middle"
+       font-size="11"
+       fill="#999999"
+       id="text20"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:28.9276px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:1"
+       transform="scale(0.99993487,1.0000651)">RING_SIZ = 5</text>
+    <g
+       id="g21"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <rect
+         x="150"
+         y="52"
+         width="150"
+         height="26"
+         rx="5"
+         fill="#f3ecff"
+         stroke="#5a2ca0"
+         id="rect20"
+         style="stroke-width:0.553105" />
+      <text
+         x="225"
+         y="70"
+         text-anchor="middle"
+         font-size="13px"
+         fill="#5a2ca0"
+         id="text21"
+         style="stroke-width:0.553105">nextShow_ = 40</text>
+      <path
+         d="m 278,72 c 22,12 22,2 22,24"
+         fill="none"
+         stroke="#5a2ca0"
+         stroke-width="1.10621"
+         marker-end="url(#arrow)"
+         id="path21" />
+    </g>
+    <g
+       id="g22"
+       style="stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <rect
+         x="18"
+         y="120"
+         width="150"
+         height="26"
+         rx="5"
+         fill="#eaf1fb"
+         stroke="#3a5a8a"
+         id="rect21"
+         style="stroke-width:0.553105" />
+      <text
+         x="93"
+         y="138"
+         text-anchor="middle"
+         font-size="13px"
+         fill="#3a5a8a"
+         id="text22"
+         style="stroke-width:0.553105">nextRead_ = 44</text>
+      <path
+         d="m 110,146 c 10,22 28,22 40,36"
+         fill="none"
+         stroke="#3a5a8a"
+         stroke-width="1.10621"
+         marker-end="url(#arrow)"
+         id="path22" />
+    </g>
+    <g
+       font-size="12px"
+       transform="matrix(1.8078582,0,0,1.8080937,73.26744,786.87175)"
+       id="g28"
+       style="stroke-width:0.553105">
+      <text
+         x="0"
+         y="0"
+         font-weight="bold"
+         font-size="13px"
+         id="text23"
+         style="stroke-width:0.553105">States:</text>
+      <rect
+         x="66"
+         y="-11"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#dbe9ff"
+         stroke="#3a5a8a"
+         id="rect23"
+         style="stroke-width:0.553105" />
+      <text
+         x="86"
+         y="1"
+         id="text24"
+         style="stroke-width:0.553105">FREE</text>
+      <rect
+         x="140"
+         y="-11"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#ffedcc"
+         stroke="#b8860b"
+         id="rect24"
+         style="stroke-width:0.553105" />
+      <text
+         x="160"
+         y="1"
+         id="text25"
+         style="stroke-width:0.553105">READ</text>
+      <rect
+         x="216"
+         y="-11"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#d8f0d8"
+         stroke="#3a7a3a"
+         id="rect25"
+         style="stroke-width:0.553105" />
+      <text
+         x="236"
+         y="1"
+         id="text26"
+         style="stroke-width:0.553105">FEED</text>
+      <rect
+         x="292"
+         y="-11"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#e7d8ff"
+         stroke="#5a2ca0"
+         id="rect26"
+         style="stroke-width:0.553105" />
+      <text
+         x="312"
+         y="1"
+         id="text27"
+         style="stroke-width:0.553105">SHOW</text>
+      <rect
+         x="372"
+         y="-11"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#ffd6d6"
+         stroke="#a00000"
+         id="rect27"
+         style="stroke-width:0.553105" />
+      <text
+         x="392"
+         y="1"
+         id="text28"
+         style="stroke-width:0.553105">STOP</text>
+    </g>
+    <g
+       id="g52"
+       style="display:inline;stroke-width:0.553105"
+       transform="matrix(1.8078582,0,0,1.8080937,0.95311217,-77.397037)">
+      <path
+         d="m 395,138 a 130,130 0 0 1 57,162"
+         fill="none"
+         stroke="#bbbbbb"
+         stroke-width="1.10621"
+         stroke-dasharray="4, 5"
+         marker-end="url(#arrowRot)"
+         id="path4" />
+      <text
+         x="470"
+         y="320"
+         font-size="12px"
+         fill="#999999"
+         id="text19"
+         style="stroke-width:0.553105">advances</text>
+      <circle
+         cx="310"
+         cy="120"
+         r="46"
+         fill="#e7d8ff"
+         stroke="#5a2ca0"
+         stroke-width="1.21683"
+         id="circle19" />
+      <text
+         x="310"
+         y="112"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text29"
+         style="stroke-width:0.553105">SHOW</text>
+      <text
+         x="310"
+         y="132"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text30"
+         style="stroke-width:0.553105">frame 40</text>
+      <text
+         x="381.12689"
+         y="104.65192"
+         text-anchor="middle"
+         font-size="11"
+         fill="#888888"
+         id="text31"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 0</text>
+      <circle
+         cx="452"
+         cy="203"
+         r="46"
+         fill="#d8f0d8"
+         stroke="#3a7a3a"
+         stroke-width="1.21683"
+         id="circle31" />
+      <text
+         x="452"
+         y="199"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text32"
+         style="stroke-width:0.553105">FEED</text>
+      <text
+         x="452"
+         y="219"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text33"
+         style="stroke-width:0.553105">frame 41</text>
+      <text
+         x="524.60187"
+         y="200"
+         text-anchor="middle"
+         font-size="11px"
+         fill="#888888"
+         id="text34"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 1</text>
+      <circle
+         cx="398"
+         cy="371"
+         r="46"
+         fill="#ffedcc"
+         stroke="#b8860b"
+         stroke-width="1.21683"
+         id="circle34" />
+      <text
+         x="398"
+         y="367"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text35"
+         style="stroke-width:0.553105">READ</text>
+      <text
+         x="398"
+         y="387"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text36"
+         style="stroke-width:0.553105">frame 42</text>
+      <text
+         x="398.65192"
+         y="439.17114"
+         text-anchor="middle"
+         font-size="11"
+         fill="#888888"
+         id="text37"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 2</text>
+      <circle
+         cx="222"
+         cy="371"
+         r="46"
+         fill="#ffedcc"
+         stroke="#b8860b"
+         stroke-width="1.21683"
+         id="circle37" />
+      <text
+         x="222"
+         y="367"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text38"
+         style="stroke-width:0.553105">READ</text>
+      <text
+         x="222"
+         y="387"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text39"
+         style="stroke-width:0.553105">frame 43</text>
+      <text
+         x="222.65192"
+         y="439.17114"
+         text-anchor="middle"
+         font-size="11"
+         fill="#888888"
+         id="text40"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 3</text>
+      <circle
+         cx="168"
+         cy="203"
+         r="46"
+         fill="#dbe9ff"
+         stroke="#3a5a8a"
+         stroke-width="1.21683"
+         id="circle40" />
+      <text
+         x="168"
+         y="199"
+         text-anchor="middle"
+         font-size="14px"
+         font-weight="bold"
+         id="text41"
+         style="stroke-width:0.553105">FREE</text>
+      <text
+         x="168"
+         y="219"
+         text-anchor="middle"
+         font-size="12px"
+         fill="#444444"
+         id="text42"
+         style="stroke-width:0.553105">—</text>
+      <text
+         x="90.182777"
+         y="198.69617"
+         text-anchor="middle"
+         font-size="11px"
+         fill="#888888"
+         id="text43"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">slot 4</text>
+      <text
+         x="310"
+         y="277"
+         text-anchor="middle"
+         font-size="11"
+         fill="#999999"
+         id="text44"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke-width:0.553105">RING_SIZ = 5</text>
+      <rect
+         x="150"
+         y="52"
+         width="150"
+         height="26"
+         rx="5"
+         fill="#f3ecff"
+         stroke="#5a2ca0"
+         id="rect44"
+         style="stroke-width:0.553105" />
+      <text
+         x="225"
+         y="70"
+         text-anchor="middle"
+         font-size="13px"
+         fill="#5a2ca0"
+         id="text45"
+         style="stroke-width:0.553105">nextShow_ = 40</text>
+      <path
+         d="m 278,72 c 22,12 22,2 22,24"
+         fill="none"
+         stroke="#5a2ca0"
+         stroke-width="1.10621"
+         marker-end="url(#arrow)"
+         id="path45" />
+      <rect
+         x="18"
+         y="120"
+         width="150"
+         height="26"
+         rx="5"
+         fill="#eaf1fb"
+         stroke="#3a5a8a"
+         id="rect45"
+         style="stroke-width:0.553105" />
+      <text
+         x="93"
+         y="138"
+         text-anchor="middle"
+         font-size="13px"
+         fill="#3a5a8a"
+         id="text46"
+         style="stroke-width:0.553105">nextRead_ = 44</text>
+      <path
+         d="m 110,146 c 10,22 28,22 40,36"
+         fill="none"
+         stroke="#3a5a8a"
+         stroke-width="1.10621"
+         marker-end="url(#arrow)"
+         id="path46" />
+      <text
+         x="40"
+         y="478"
+         font-weight="bold"
+         font-size="13px"
+         id="text47"
+         style="stroke-width:0.553105">States:</text>
+      <rect
+         x="106"
+         y="467"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#dbe9ff"
+         stroke="#3a5a8a"
+         id="rect47"
+         style="font-size:12px;stroke-width:0.553105" />
+      <text
+         x="126"
+         y="479"
+         id="text48"
+         style="font-size:12px;stroke-width:0.553105">FREE</text>
+      <rect
+         x="180"
+         y="467"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#ffedcc"
+         stroke="#b8860b"
+         id="rect48"
+         style="font-size:12px;stroke-width:0.553105" />
+      <text
+         x="200"
+         y="479"
+         id="text49"
+         style="font-size:12px;stroke-width:0.553105">READ</text>
+      <rect
+         x="256"
+         y="467"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#d8f0d8"
+         stroke="#3a7a3a"
+         id="rect49"
+         style="font-size:12px;stroke-width:0.553105" />
+      <text
+         x="276"
+         y="479"
+         id="text50"
+         style="font-size:12px;stroke-width:0.553105">FEED</text>
+      <rect
+         x="332"
+         y="467"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#e7d8ff"
+         stroke="#5a2ca0"
+         id="rect50"
+         style="font-size:12px;stroke-width:0.553105" />
+      <text
+         x="352"
+         y="479"
+         id="text51"
+         style="font-size:12px;stroke-width:0.553105">SHOW</text>
+      <rect
+         x="412"
+         y="467"
+         width="15"
+         height="15"
+         rx="3"
+         fill="#ffd6d6"
+         stroke="#a00000"
+         id="rect51"
+         style="font-size:12px;stroke-width:0.553105" />
+      <text
+         x="432"
+         y="479"
+         id="text52"
+         style="font-size:12px;stroke-width:0.553105">STOP</text>
+    </g>
   </g>
-  <text x="40" y="516" font-size="12" fill="#666">
-    Between the two cursors lie the frames currently in flight (READ) or ready (FEED);
-  </text>
-  <text x="40" y="534" font-size="12" fill="#666">
-    the gap can never exceed RING_SIZ — that is where the back-pressure lives.
-  </text>
 </svg>
diff --git a/FrOSCon26/drawings/state-engine.svg b/FrOSCon26/drawings/state-engine.svg
index ac4135b..5455191 100644
--- a/FrOSCon26/drawings/state-engine.svg
+++ b/FrOSCon26/drawings/state-engine.svg
@@ -1,83 +1,332 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
- "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <!-- Generated by graphviz version 2.42.4 (0)
  -->
+
 <!-- Title: BuffState Pages: 1 -->
-<svg width="762pt" height="210pt"
- viewBox="0.00 0.00 762.00 209.94" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
-<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 205.94)">
-<title>BuffState</title>
-<text text-anchor="middle" x="377" y="-186.74" font-family="sans-serif" font-size="14.00">Life&#45;cycle of one buffer »slot«</text>
-<!-- FREE -->
-<g id="node1" class="node">
-<title>FREE</title>
-<ellipse fill="#dbe9ff" stroke="black" stroke-width="1.4" cx="32.5" cy="-94.44" rx="32.5" ry="32.5"/>
-<text text-anchor="middle" x="32.5" y="-91.34" font-family="sans-serif" font-size="12.00">FREE</text>
-</g>
-<!-- READ -->
-<g id="node2" class="node">
-<title>READ</title>
-<ellipse fill="#ffedcc" stroke="black" stroke-width="1.4" cx="275.5" cy="-94.44" rx="32.5" ry="32.5"/>
-<text text-anchor="middle" x="275.5" y="-91.34" font-family="sans-serif" font-size="12.00">READ</text>
-</g>
-<!-- FREE&#45;&gt;READ -->
-<g id="edge1" class="edge">
-<title>FREE&#45;&gt;READ</title>
-<path fill="none" stroke="black" d="M65.01,-94.44C108.04,-94.44 185.27,-94.44 232.99,-94.44"/>
-<polygon fill="black" stroke="black" points="232.99,-97.94 242.99,-94.44 232.99,-90.94 232.99,-97.94"/>
-<text text-anchor="start" x="83" y="-108.44" font-family="sans-serif" font-size="10.00"> &#160;submit read</text>
-<text text-anchor="start" x="83" y="-97.44" font-family="sans-serif" font-size="10.00"> &#160;addNextReadSubmissions()</text>
-</g>
-<!-- FEED -->
-<g id="node3" class="node">
-<title>FEED</title>
-<ellipse fill="#d8f0d8" stroke="black" stroke-width="1.4" cx="503.5" cy="-146.44" rx="32.5" ry="32.5"/>
-<text text-anchor="middle" x="503.5" y="-143.34" font-family="sans-serif" font-size="12.00">FEED</text>
-</g>
-<!-- READ&#45;&gt;FEED -->
-<g id="edge2" class="edge">
-<title>READ&#45;&gt;FEED</title>
-<path fill="none" stroke="black" d="M307.45,-101.56C347.49,-110.77 417.35,-126.84 461.69,-137.05"/>
-<polygon fill="black" stroke="black" points="461.03,-140.49 471.56,-139.32 462.6,-133.67 461.03,-140.49"/>
-<text text-anchor="start" x="326" y="-147.44" font-family="sans-serif" font-size="10.00"> &#160;read completed OK</text>
-<text text-anchor="start" x="326" y="-136.44" font-family="sans-serif" font-size="10.00"> &#160;handleCompletedRead()</text>
-</g>
-<!-- STOP -->
-<g id="node5" class="node">
-<title>STOP</title>
-<ellipse fill="#ffd6d6" stroke="black" stroke-width="1.4" cx="503.5" cy="-61.44" rx="30.5" ry="30.5"/>
-<ellipse fill="none" stroke="black" stroke-width="1.4" cx="503.5" cy="-61.44" rx="34.5" ry="34.5"/>
-<text text-anchor="middle" x="503.5" y="-58.34" font-family="sans-serif" font-size="12.00">STOP</text>
-</g>
-<!-- READ&#45;&gt;STOP -->
-<g id="edge3" class="edge">
-<title>READ&#45;&gt;STOP</title>
-<path fill="none" stroke="#a00000" d="M307.92,-89.85C347.22,-84.11 414.71,-74.26 458.97,-67.79"/>
-<polygon fill="#a00000" stroke="#a00000" points="459.75,-71.22 469.14,-66.31 458.74,-64.29 459.75,-71.22"/>
-<text text-anchor="middle" x="388.5" y="-89.44" font-family="sans-serif" font-size="10.00" fill="#a00000"> &#160;short read / EOF &#160;</text>
-</g>
-<!-- SHOW -->
-<g id="node4" class="node">
-<title>SHOW</title>
-<ellipse fill="#e7d8ff" stroke="black" stroke-width="1.4" cx="721.5" cy="-146.44" rx="32.5" ry="32.5"/>
-<text text-anchor="middle" x="721.5" y="-143.34" font-family="sans-serif" font-size="12.00">SHOW</text>
-</g>
-<!-- FEED&#45;&gt;SHOW -->
-<g id="edge4" class="edge">
-<title>FEED&#45;&gt;SHOW</title>
-<path fill="none" stroke="black" d="M536.37,-146.44C574.13,-146.44 637.14,-146.44 678.76,-146.44"/>
-<polygon fill="black" stroke="black" points="678.85,-149.94 688.85,-146.44 678.85,-142.94 678.85,-149.94"/>
-<text text-anchor="start" x="556" y="-160.44" font-family="sans-serif" font-size="10.00"> &#160;publish frame</text>
-<text text-anchor="start" x="556" y="-149.44" font-family="sans-serif" font-size="10.00"> &#160;maybeDisplayFrame()</text>
-</g>
-<!-- SHOW&#45;&gt;FREE -->
-<g id="edge5" class="edge">
-<title>SHOW&#45;&gt;FREE</title>
-<path fill="none" stroke="#5a2ca0" d="M698.02,-123.55C665.91,-92.66 603.51,-39.12 538,-18.44 369.44,34.78 157.11,-41.15 71.68,-77.22"/>
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-<text text-anchor="start" x="328.5" y="-19.44" font-family="sans-serif" font-size="10.00" fill="#5a2ca0"> &#160;GUI released frame</text>
-<text text-anchor="start" x="328.5" y="-8.44" font-family="sans-serif" font-size="10.00" fill="#5a2ca0"> &#160;(toDisplay_ == nullptr)</text>
-</g>
-</g>
+
+<svg
+   width="14.58cm"
+   height="12.09cm"
+   viewBox="0 0 499.99993 414.609"
+   version="1.1"
+   id="svg15"
+   sodipodi:docname="state-engine.svg"
+   inkscape:version="1.4.3 (0d15f75042, 2025-12-25)"
+   inkscape:export-filename="../../state-engine.svg"
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