In iOS 9 public beta, Sampler Audio Units (EXS24/AUSampler) don't behave the same as in iOS 8 and previous versions. Playing EXS24/AUSampler instruments always results in cutout notes/muted notes.
Expected Results
All notes should be played by the AUSampler instrument.
Actual Results
On iOS 9, several notes will not be played by the AUSampler instrument.
On iOS 8 and prior, all notes play just fine.