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.
Sketch Synth 2 is free at the moment
Might be interesting to some of you:
Sketch Synth 2 - Shape and Sculpt sounds with a selection of pad based instruments, each containing an XY pad that controls 8 loops and 4 effects, possibly best referred to as a pad based rompler. The whole premise of Sketch Synth 2 is to make it easy for you to draw sounds and draw on effects to give your sounds geometric character without having to learn anything complicated, just push buttons and draw sound.
Comments
The dev says that all his apps are now free as he no longer has the time to update as he is working on another project..