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directx sound

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I am at the beginning of directx programing and i want to know how to adjust volume at a mp3,wav and midi sound. i am using directx 8.1 sdk . please help tnx

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If you create it with DSBCAPS_CTRLVOLUME then you can control the volume by using SetVolume(volume) of a secondary buffer.
int volume = 0;////-9600 silence, 0 sound

As for controlling the volume of mp3s I am not sure, one way would be to change the computers global volume...
IDirectMusicPerformance8* ptr;
Long Range=0;//Range is from -20000 to 2000

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