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вот нашел код говорят работает но у меня не компилится
[spoiler=]#undef UNICODE
#include <windows.h>
#include <mmsystem.h>

HMIXER hMixer;
MIXERLINE ml;
MIXERLINECONTROLS mlc;
MIXERCONTROL mc;
MIXERCONTROLDETAILS mcd;
DWORD Volume;
MMRESULT Ret;

void main (void)
{
Ret = mixerOpen(&hMixer, 0, NULL, NULL, 0);
if (Ret != MMSYSERR_NOERROR) return;

ml.cbStruct = sizeof(ml);
ml.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;

Ret = mixerGetLineInfo((HMIXEROBJ)hMixer, &ml, MIXER_GETLINEINFOF_COMPONENTTYPE);
if (Ret != MMSYSERR_NOERROR) return;

mlc.cbStruct = sizeof(mlc);
mlc.dwLineID = ml.dwLineID;

mlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;

mlc.cControls = 1;
mlc.cbmxctrl = sizeof(mc);
mlc.pamxctrl = &mc;
mc.cbStruct = sizeof(mc);

Ret = mixerGetLineControls((HMIXEROBJ)hMixer, &mlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
if (Ret != MMSYSERR_NOERROR) return;

mcd.cbStruct = sizeof(mcd);
mcd.cbDetails = sizeof(Volume);
mcd.paDetails = &Volume;
mcd.dwControlID = mc.dwControlID;
mcd.cChannels = 1;
mixerGetControlDetails((HMIXEROBJ)hMixer, &mcd, MIXER_GETCONTROLDETAILSF_VALUE);

Volume = !Volume;

mixerSetControlDetails((HMIXEROBJ)hMixer, &mcd, MIXER_SETCONTROLDETAILSF_VALUE);
PlaySound(TEXT("c:\\windows\\media\\Alarm01.wav"), NULL, SND_FILENAME | SND_ASYNC);

mixerClose(hMixer);
}[/spoiler]