Sound streaming problems

I'm trying to make an arbitrary large (~1M) sound file loop using KOS 1.3.
All I get for sound, though, is static.
I believe the problem lies with my callback:

Code:

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void *sound_callback(snd_stream_hnd_t hnd, int size, int *size_out)
{
  if (size > SND_STREAM_BUFFER_MAX) {
      size = SND_STREAM_BUFFER_MAX;
  }

  /* move old data out of PCM buffer */
  if (last_read > 0) {
                                        printf("moving old data out.\n");
      sound_count -= last_read;
      if (sound_count < 0)                      // prevent underrun
        sound_count = 0;
      memcpy(sound_buffer, sound_buffer+last_read, sound_count);
      sound_ptr = sound_buffer + sound_count;
  }

  /* fill buffer with 4k chunks */
  long num_bytes_copied = 0;
  while (sound_count < size && file_remaining > 0) {          // file_remaining shouldn't be 0
if looping
      if (file_remaining >= 4096) {
        memcpy(sound_ptr, file_ptr, 4096);    // read data from file_buffer into sound_buffer
        file_remaining -= 4096;
        if (file_remaining == 0 && loop == 1)  // if loop is 1, start over
            file_remaining = file_length;

        num_bytes_copied += 4096;
        sound_ptr  += 4096;
        sound_count += 4096;
        file_ptr    += 4096;
      } else {                                  // executes if there is less than 4k in file_remaining
        memcpy(sound_ptr, file_ptr, file_remaining);
        num_bytes_copied  += file_remaining;
        if (loop == 1)
            file_remaining = file_length;      // if loop is set, start from beginning
        else
            file_remaining = 0;                // if no loop, end it here
        sound_ptr  += file_remaining;
        sound_count += file_remaining;
        file_ptr    += file_remaining;
      }

      //sound_count += num_bytes_copied ;
      //sound_ptr  += num_bytes_copied ;

      if (num_bytes_copied  == 0)
        break;
  }

  if (sound_count > size)
      *size_out = size;
  else
      *size_out = sound_count;

  last_read = *size_out;

  if (num_bytes_copied == 0)
      return NULL;
  else
      return sound_buffer;
}

---

Any help would be greatly appreciated.
-yeddish