I have one completed iOS music player app, except for one sound altering feature that I need someone skilled in music and coding to help make the way I need. The feature is to change the tempo of the music by slider between 80% and 120%. But the sound quality and flow has to be preserved. And you need to be able to change the music 1% at a time.
If you believe you might have sufficient skill set, message me and I can give more details about the project.