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.
Multiple app issue
I am having a problem getting 2 apps working together. First I am running an iPad 6 with up to date IOS. I have two apps I want to work with—Anytune and Amplitude. I do not want to do any recording or anything fancy just use Amplitude as an amp simulator and Anytune to learn songs on my guitar. When I load Anytune as an input on line one as the only app within Audiobus there is no problem. Once I launch Amplitude as a second input on line 2, I lose all the sound from Anytune. The sound meter in the mixer shows that it is receiving an input but there is only silence at the output which is set as the system speaker / headphones. If I delete Amplitude as an input and close the app right down the sound is still gone. To regain the sound I have to shut everything down and restart again. Any help?