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.

So has anyone tried Paul by Design's FM20 (4-op AUv3 FM synth) public beta?

I was excited to find out about it, but I heard it was full at the time.
Here's the link:


  • It’s realy good. Especially the one screen with all parameters. Also the stepsequencer

  • Any more info about this one?
    I wonder how to play chords and how to properly set notes in the step sequencer.

  • edited March 2023

    Very nice UI but there are much better FM synths on iOS … after 10 minutes of trying deleted it, except of nice UI brings nothing new on the table and when compared to let’s say Nambu or Bleass Omega it feels weak.

  • Says the beta is full unfortunately but love his stuff. The grooveboxes and effects series’s are great.

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