Hi John,

> what the value for the following:
>MMRESULT waveOutOpen(
>LPHWAVEOUT phwo,
>UINT uDeviceID,
>LPWAVEFORMATEX pwfx,
>DWORD dwCallback,
>DWORD dwCallbackInstance,
>DWORD fdwOpen
>);
>
>MMRESULT waveOutSetVolume(
>HWAVEOUT hwo, && especially this
>DWORD dwVolume
>);


What values you have to use in the waveOutOpen() function depends on what you are trying to do, especially those in the LPWAVEFORMATEX structure. hwo in waveOutSetVolume is that value that waveOutOpen returns in phwo. uDeviceID can be an ID or the constant WAVE_MAPPER (2) which chooses a device that matches your criteria. dwCallback and dwCallbackInstance should be 0. fdwOpen should be CALLBACK_NULL (0x00000000l). dwVolume contains the desired volume.

Christof