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.
BEATFORMER by Accusonus - About to Disappear?
I'm making a prediction as it looks like BeatFormer is still in the App Store at the moment, but I was really close to purchasing a couple of other Accusonus products for desktop and so just discovered that their Web site says the company is "embarking on a new adventure" and those products are no longer available for purchase.
Therefore, I would not be surprised if BeatFormer (an excellent app for shaping drums) disappears from the App Store soon. I'm actually surprised it's still even showing up!
Just a heads up...