If there's any demand for this, I can update it for 3.5 for native targets (I have it working in a demo)
Place this code into an import event:
@:access(lime.media.AudioSource.backend)
@:access(openfl.media.SoundChannel.__source)
@:access(lime._backend.native.NativeAudioSource.handle)
Then use this code whenever you want to change the pitch (with the 1 being the sound channel to set the pitch on and the 1.2 being the pitch (where 1 is normal)
lime.media.openal.AL.sourcef(Engine.engine.channels[1].currentSound.__source.backend.handle, lime.media.openal.AL.PITCH, 1.2);
This currently messes up audio looping, but I can fix this if there is the demand