I am a fitness instructor and in the past we were using CD's as a source of music and using the pitch control knob of the amplifier to synchronise the beat of the music to the aerobic moves. Now, that I am using an iPod as my source of music , the pitch control knob does not interact with any sources coming through the auxilliary plug. Is there anyway I can integrate a Pitch control mode (app, hardware,program) into my iPod or iTouch? An average song is usually 136bpm. At time I need to reduce the pitch to 128bpm or increase the pitch to 144bpm. Thank you for helping me with this issue.