diff --git a/src/tool/alsa.c b/src/tool/alsa.c
new file mode 100644
index 000000000..e6c4afbba
--- /dev/null
+++ b/src/tool/alsa.c
@@ -0,0 +1,148 @@
+#include <err.h>
+#include <math.h>
+#include <stdlib.h>
+
+#include <alsa/asoundlib.h>
+
+static snd_pcm_t* playback_handle = 0;
+static snd_pcm_sw_params_t* sw_params = 0;
+static snd_pcm_hw_params_t* hw_params = 0;
+static snd_pcm_sframes_t buffer_size = 0;
+
+static snd_pcm_sframes_t written = 0;
+static snd_pcm_sframes_t delay = 0;
+
+static unsigned int rate = 44100;
+
+static int audio_initialized = 0;
+
+size_t
+audio_offset()
+{
+  snd_pcm_delay(playback_handle, &delay);
+
+  return written - delay;
+}
+
+void
+audio_init()
+{
+  unsigned int buffer_time = 50000;
+  const char* device;
+  int err;
+
+  if(audio_initialized)
+    return;
+
+  audio_initialized = 1;
+
+  device = getenv("ALSA_DEVICE");
+
+  if(!device)
+    device = "default";
+
+  if(0 > (err = snd_pcm_open(&playback_handle, device,
+                             SND_PCM_STREAM_PLAYBACK, 0/*SND_PCM_NONBLOCK*/)))
+    errx(EXIT_FAILURE, "Audio: Cannot open device %s: %s", device, snd_strerror(err));
+
+  if(0 > (err = snd_pcm_sw_params_malloc(&sw_params)))
+    errx(EXIT_FAILURE, "Audio: Could not allocate software parameter structure: %s",
+         snd_strerror(err));
+
+  if(0 > (err = snd_pcm_hw_params_malloc(&hw_params)))
+    errx(EXIT_FAILURE, "Audio: Could not allocate hardware parameter structure: %s",
+         snd_strerror(err));
+
+  if(0 > (err = snd_pcm_hw_params_any(playback_handle, hw_params)))
+    errx(EXIT_FAILURE, "Audio: Could not initializa hardware parameters: %s",
+         snd_strerror(err));
+
+  if(0 > (err = snd_pcm_hw_params_set_access(playback_handle, hw_params,
+                                             SND_PCM_ACCESS_RW_INTERLEAVED)))
+    errx(EXIT_FAILURE, "Audio: Could not set access type: %s", snd_strerror(err));
+
+  if(0 > (err = snd_pcm_hw_params_set_format(playback_handle, hw_params,
+                                             SND_PCM_FORMAT_S16)))
+    errx(EXIT_FAILURE, "Audio: Could not set sample format to signed 16 bit "
+         "native endian: %s", snd_strerror(err));
+
+  if(0 > (err = snd_pcm_hw_params_set_rate_near(playback_handle, hw_params,
+                                                &rate, 0)))
+    errx(EXIT_FAILURE, "Audio: Could not set sample rate %uHz: %s", rate,
+         snd_strerror(err));
+
+  if(0 > (err = snd_pcm_hw_params_set_channels(playback_handle, hw_params, 2)))
+    errx(EXIT_FAILURE, "Audio: Could not set channel count to %u: %s",
+         2, snd_strerror(err));
+
+  snd_pcm_hw_params_set_buffer_time_near(playback_handle, hw_params, &buffer_time, 0);
+
+  if(0 > (err = snd_pcm_hw_params(playback_handle, hw_params)))
+    errx(EXIT_FAILURE, "Audio: Could not set hardware parameters: %s", snd_strerror(err));
+
+  fprintf(stderr, "Buffer time is %.3f seconds\n", buffer_time / 1.0e6);
+
+  if(0 > (err = snd_pcm_sw_params_current(playback_handle, sw_params)))
+    errx(EXIT_FAILURE, "Audio: Could not initialize software parameters: %s",
+         snd_strerror(err));
+
+  snd_pcm_sw_params_set_start_threshold(playback_handle, sw_params, 0);
+  snd_pcm_sw_params_set_avail_min(playback_handle, sw_params, 1024);
+
+  snd_pcm_uframes_t min;
+  snd_pcm_sw_params_get_avail_min(sw_params, &min);
+  fprintf(stderr, "Minimum %u\n", (unsigned) min);
+
+  if(0 > (err = snd_pcm_sw_params(playback_handle, sw_params)))
+    errx(EXIT_FAILURE, "Audio: Could not set software parameters: %s",
+        snd_strerror(err));
+
+  buffer_size = snd_pcm_avail_update(playback_handle);
+}
+
+size_t
+audio_write(const void* data, size_t amount)
+{
+  int err;
+
+  amount /= 4;
+
+  for(;;)
+    {
+      err = snd_pcm_writei(playback_handle, data, amount);
+
+      if(err == -EAGAIN)
+        return 0;
+
+      if(err < 0)
+        {
+          err = snd_pcm_recover(playback_handle, err, 0);
+
+          if(err < 0)
+            errx(EXIT_FAILURE, "Audio playback failed: %s", strerror(-err));
+        }
+
+
+      break;
+    }
+
+  written += err;
+
+  err *= 4;
+
+  return err;
+}
+
+void
+audio_start(unsigned int rate, unsigned int channel_count)
+{
+  audio_init();
+
+  snd_pcm_prepare(playback_handle);
+}
+
+void
+audio_stop()
+{
+  snd_pcm_drain(playback_handle);
+}
diff --git a/src/tool/main.c b/src/tool/main.c
new file mode 100644
index 000000000..4e6b1adc6
--- /dev/null
+++ b/src/tool/main.c
@@ -0,0 +1,27 @@
+#include <unistd.h>
+#include <stdint.h>
+#include "alsa.c"
+
+#define SAMPLE_RATE 44100
+
+int16_t quiet[SAMPLE_RATE], noisy[SAMPLE_RATE];
+
+void main () {
+
+    for (int i=0; i<SAMPLE_RATE; i++)
+    {
+        quiet[i] = 0;
+        noisy[i] = i%30000;
+    }
+    audio_start(44100, 2);
+
+    for (int i=0; i<10; i++)
+    {
+        audio_write(noisy, SAMPLE_RATE);
+        printf("=================================\n");
+        audio_write(quiet, SAMPLE_RATE);
+        printf("\n");
+    }
+
+    audio_stop();
+}