Sound Help

I am needing something that will allow me to play pure tones. I need to have control of three things: frequency, duration, and volume. I would use Beep except for it doesn't let you control volume and it's not asynchronous. If someone could point to a function or library I would be most appreciative.

You could try something like OpenAL.

I would use the sdl
http://www.libsdl.org/intro/usingsound.html
"code snippette from their site, play a tone"

Code:

---

Example:

#include "SDL.h"
#include "SDL_audio.h"
{
    extern void mixaudio(void *unused, Uint8 *stream, int len);
    SDL_AudioSpec fmt;

    /* Set 16-bit stereo audio at 22Khz */
    fmt.freq = 22050;
    fmt.format = AUDIO_S16;
    fmt.channels = 2;
    fmt.samples = 512;        /* A good value for games */
    fmt.callback = mixaudio;
    fmt.userdata = NULL;

    /* Open the audio device and start playing sound! */
    if ( SDL_OpenAudio(&fmt, NULL) < 0 ) {
        fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
        exit(1);
    }
    SDL_PauseAudio(0);

    ...

    SDL_CloseAudio();
}

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I'm using the SDL graphic libraries at the moment and they are very nice. i havnt had time to work with sound yet but i'm hoping this will help you.
Google SDL for more info