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.
Choosing the right Audio Interface
Interesting read about choosing the right budget interface
Comments
It’s just a Yamaha advertorial really though.
bonden.de has lots of tests at its site. Only hurdle might be that's written in german.
its not really about Yahama @BiancaNeve , its about what to look for , it just happen that Performer Music Resource and Yamaha did it and Yamaha/Steinberg interfaces wear used.