Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.
Download on the App StoreAudiobus is the app that makes the rest of your setup better.
Comments
I miss something like Acid for my iOS biotope so much!! Sometimes i am hoping, that tools like blockswave could go into this direction, once a day.
The original inventor of ACID actually later implemented the same technology at Apple. I'd say you can use GarageBand iOS almost exactly like ACID. Just drag in a loop and slide the edges to arrange. The loop browser will even preview in sync during playback
Original author of ACID: https://www.crunchbase.com/person/chris-moulios#/entity