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Re: NewTimePitch AudioUnit increases volume?
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Re: NewTimePitch AudioUnit increases volume?


  • Subject: Re: NewTimePitch AudioUnit increases volume?
  • From: Brian Willoughby <email@hidden>
  • Date: Wed, 05 Sep 2012 19:38:15 -0700


On Sep 5, 2012, at 10:04, Bruno Di Giorgi wrote:
I'm experimenting with NewTimePitch Unit, and having success in doing time and pitch changing in real time.
However I have a little issue:

When time (kTimePitchParam_Rate) changes from 1 or pitch (kNewTimePitchParam_Pitch) changes from 0 Volume rises of a factor of about 1.3. Then comes back to normal when values are back to defaults, as if unit with default values is bypassed then actives (rising volume) when changing values.
Now I'm compensating in OutputUnit, lowering volume to about 0.7.
Is this the normal behavior of this unit?

No. I don't think so, but I've only used the older TimePitch units.

I guess you have a mono/stereo issue in your graph, such that left +right are being combined in the TimePitch unit. That would explain the 3 dB change in volume. As to how you fix this, I don't know, but you should check your graph to make sure all inputs and outputs match in channel count.

Brian Willoughby
Sound Consulting

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