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.
Jam Track Apps
I probably spend as much time if not more playing along with the Pro Band app's various guitar jam tracks as I do with any other music creation or recording app. Pro Band is by far the best guitar jam app that I've found to help me practice chords and scales. It's mostly blues but the creator has started adding different genres. I've tried some other apps but they're not as comprehensive. Does anybody jam along with another app? Is there something good out there for keys?
Comments
Try this one @cheesesteak, and more by Ninebuzz, and AB supported. Jam Tracks.
https://itunes.apple.com/us/app/piano-jam-tracks-scale-trainer/id681995055?mt=8
They also have guitar jam tracks.
I already have the Ninebuzz products but they're not as "complete" as Pro Band.
https://itunes.apple.com/us/app/pro-band/id447307945?mt=8
I just use the Jamplay app for this kind of thing. It's all free and offers a decent selection and various genres. It's all band in a can stuff, but it works great for being free!