QuickTime apparently has a built-in MIDI synthesizer. I would like to send MIDI output to a virtual MIDI device that will use this synthesizer. Can this be done?

1 Answer 1


Quicktime 7 had Midi playback capabilities, but no method to generate its own data for output that I'm aware of.
It didn't sound very good anyway & almost no-one ever used it for anything even half serious ;)

Quicktime 7 is deprecated & will no longer work in Catalina. Newer Quicktime versions do not have Midi playback capability.

In Applications/Utilities/AudioMIDI Setup there is a routing device known as the IAC Bus [Window menu or Cmd/2 to show it]that can route Midi between any capable apps. It's always been somewhat under-used & tbh even as a sound engineer who's been using Midi for 35 years I haven't had occasion to use it since maybe the early 90s.. honestly, I've forgotten how you even wire it up these days.

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I'm sure you'd be better off finding a cheap or freeware Midi sequencer app - Garageband comes with the Mac, but there are others.

  • Follow-up question: Is it possible to use GarageBand as a MIDI output device?
    – Thom Smith
    Sep 11, 2019 at 17:04

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