libZPlay documentation (Win32)
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ZPlay.SetPlayerVolume Method

Set internal volume.

Pascal
function SetPlayerVolume(LeftVolume: Cardinal; RightVolume: Cardinal): Boolean;
Parameters 
Description 
LeftVolume: Cardinal 
Specifies volume for left channel. Volume range is from 0 to 100. 
RightVolume: Cardinal 
Specifies volume for right channel. Volume range is from 0 to 100. 
Return Values 
Description 
True 
All OK. 
False 
Error. To get error message read here

This function changes internal volume without affecting wave out device driver and computer master volume. You can set internal volume on each interface instance separately. 

Note: This function will cancel slide volume effect

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Web: http://libzplay.sourceforge.net/

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