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.
Best synths for experimental sounds on iOS? (Or - what would Hainbach use if he was an iOS musician?
Are there any synths on iOS that come close to doing what a beast like the Cocoquantas does, seen here in this super interesting demo by Hainbach, for instance. Things like: cross modulation of pitch between oscillators themselves, not using lfos, then allowing these sounds generated to be sampled and turned into loops inside the synth itself, these loops can then once again cross modulate each other. The most relevant section the video is from around 3 minutes onward for a few more mins, thanks!
Edit: I am guessing maybe drambo can at least do the cross modulation part? Though have no idea how it is done