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.
GESTRUMENT PRO Tutorial - Let's Make A Drum Pattern & Synth Bass Line From Scratch
Here is my first Gestrument Pro tutorial, this one covers how to make a normal drum pattern and bass line and also cover some other useful stuff.
You can get Gestrument Pro here at the App Store
https://itunes.apple.com/us/app/gestrument-pro/id1105890031?mt=8&uo=4&at=1l3voJz