Okay Kim you seem to have a handle on this sound stuff... explain this to me. I can now hear output, but I can't set any of the parameters like are set in the pcmplay example... So 8 KHz wave files come out sounding like a record playing super fast. In order to get pcmplay to work, I have to comment out all of the mixer ioctl's which set the format, frequency, etc... Or I get something like this:

ioctl(SNDCTL_DSP_SETFMT): Invalid argument

Here's the section I had to comment out to get it to play anything:

format = AFMT_S16_LE;
if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) == -1) {
perror("ioctl(SNDCTL_DSP_SETFMT)");
return -1;
}
if (format != AFMT_S16_LE) {
fprintf(stderr, "AFMT_S16_LE not available\n");
return -1;
}

stereo = 1;
if (ioctl(fd, SNDCTL_DSP_STEREO, &stereo) == -1) {
perror("ioctl(SNDCTL_DSP_STEREO)");
return -1;
}
if (!stereo) {
fprintf(stderr, "stereo selection failed\n");
return -1;
}

speed = 44100;
if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) == -1) {
perror("ioctl(SNDCTL_DSP_SPEED)");
return -1;
}
if (speed != 44100) {
fprintf(stderr, "sample speed 44100 not available (closest %u)\n", speed);
return -1;
}

Any idea what could be happening here?