Changing the pitch of a sound effect (SFX) in iOS. (Audio playback) - iphone

I have a sound effect that I play on a certain event in the game. When the player chains a few of these events together the same sound may play from 1 to 4 times in a row.
Its hard to find sfx that increase in pitch but are the same sound effect, so I was wondering is there a trick/method in iOS that you can use that will play a sound file but change the pitch(correct term?) of the sound while playing?
Many Thanks,
-Code

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Unity something went wrong when play too many audio clips simultaneously

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I found when there's too many audio clips playing simultaneously (20 audio clips or more per second), the audio output becomes stuttered, disorder, and the audio clips played earlier will temporarily be muted until the number of simultaneous audio clips playing is cut down to a certain amount...
It's common in difficult levels of rhythm games (play many audio clips simultaneously), I'm wondering how to solve this problem.
The problem exists on Windows whether on the Editor or not, and the FPS is OK when the problem happened.
Sorry for poor English.
The expected performance is playing many audio clips simultaneously fluently.
Okay... I've found the solution myself.
Open Edit->Project Settings->Audio,
and change the setting 'Max Real Voices' and 'Max Virtual Voices'.

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This could be the source of your problem. But until you show us the code we can’t but guess.