iOS GrageBand Aliasing Issue

Hello Everyone,

I'm audio developer and at the moment I faced with a following issue:

1) Add AUv3 synth (in what you for 100% sure that doesn't have aliasing in standalone version)

2) Use just single SINE wave (Disable all effects and filters, make sure that gain <= 1.0)

3) Press note C7 or better C8

4) Drag a pitch wheel up and down

Result:

You should clearly hear aliasing/(sound artefacts, reflections in other words...). It sound as if some kind of distortion is applied or sound like a triangle instead of SINE.

The problem is that in other DAW hosts I don't hear this issue with the same synth. Actually I created also my test synth with just basic out of sine(x). And still hear aliasing. Which by the way is visible clearly in the EQ Analyzation.

I use GarageBand 2.3.9 (5067)

Thank you!