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.
Koala Sampler | iPhone Pocket Operator? - haQ attaQ
Elf Audio's Koala Sampler by Elf Audio for iPhone and iPad, is a sampler app that in many ways resembles a Pocket Operator. Koala Sampler has a sleek looking interface that is straightforward and easy to work with. Apart from the basic sampling features, it also adds some very nice no-hassle resampling options. And on top of that it also comes with global effects including stutter, rhythmic gating, reverb and tempo delay to name a few, stuff one wants to have access to when performing live. Check this out!