how to use kNewTimePitchParam_Rate ?

Media Technologies Audio
appleaudioFUN OP
Created Dec ’20
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I use kNewTimePitchParampitch ;
audiounit (in)---convert(pitch shift)---audiounit( out);I can get the result about pitch shift
status =AudioUnitSetParameter(convert, kNewTimePitchParamPitch, kAudioUnitScopeGlobal, 0, pitchShift, 0);

change param:AudioUnitSetParameter(conver, kNewTimePitchParamRate  , kAudioUnitScope_Global, 0, pitchShift, 0);

the AudioUnitAddRenderNotify can not get the data which have been change speech. the data is 00.

so how to use the rate change?

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how to use kNewTimePitchParam_Rate ?
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