iOS Musician Apps (26) Supported Technologies is Audio Unit (AU), Effect Type is Pitch effects

BandShift is a realtimemulti-band auditory filter and frequency shifter.

This app is a music player that can process the following effects in real time: Time stretch (0.5-2.0 double speed), Pitch shift (-1 ~ +1 octave), 10 band equalizer.

The Quinta Pitch Machine is more than your standard octave in that it not only gives you notes an octave up and an octave down, but also gives you a fifth up.

This is an AUv3 compatible processor friendly stereo pitch shifter plugin which can be used as a plugin with your favourite DAW such as Cubasis, Auria, Meteor or GarageBand.

Harmonizer is real time audio pitch shifter effect that can mix harmonies into the original signal or run as realtime pitch shifter.

If you play a musical instrument, this app should be supported by you lower the speed and play when you copy of a musical piece.