libZPlay documentation (Win32)
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ZPlay.SetTempo Method

Change tempo without changing pitch.

Pascal
function SetTempo(Tempo: Cardinal): Boolean;
Parameters 
Description 
Tempo: Cardinal 
New tempo value. Normal value is 100. Smaller values represent slower tempo, larger values represent faster tempo.
Note: This value can't be 0. 
Return Values 
Description 
True 
All OK. 
False 
Error. To get error message read here

Changing tempo will not change pitch. Playback will be faster or slower, but pitch will remain stable.

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