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Apple Developer Relations20-Mar-2015 07:45 AM

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Summary:
Notes defined in aupreset-file that need to be shifted, jump out of tune a few cents after about 1, 2 secs. Not shifted notes stay stable. This happens on iOS 8.x, not on iOS7.1 (device or simulator).
My app "Gender for iOS" emulates a balinese gamelan instrument, where two instruments of the same are constant detuned to each other about 5 hz, so there is any change of frequency heard immediately as the beating rate changes.

Steps to Reproduce:
Open the provided altered LoadPresetDemo:
There are three aupresets with the same three samples:
1. no pitch shifting
2. pitch shifting by a half step
3. pitch shifting through fine tuning
play the three notes with each aupreset and listen to the end of the sample.

Expected Results:
the notes frequency should stay the same from start to end

Actual Results:
iOS8.x
aupreset1 (gender0): notes stay stable
aupreset2 (gender1): notes jump up or down
aupreset3 (gender2): notes jump even twice
iOS7.1
all presets play stable straight notes.

Version:
iOS8.2, iOS8.1.3, iOS7.1