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 Store
Audiobus is the app that makes the rest of your setup better.
Another great experimental app from Giorgio Sancristoforo for Windows and Mac.
This is really amazing, it’s a kind of west coast noise maker with 4 oscillators and a very fun probabilistic sequencer that controls everything from envelopes to notes, to octave to delay feedback. It can be a sort of west coast bongo machine, krell player or ambient machine. It’s really cheap ( not a Vst though so connectivity can be a pain )