Enabling Note Track playback on Mac
What is needed
Basically you need to provide two things on your Mac:
- a software MIDI synthesizer, a synthesizer is the thing that actually makes sound from the MIDI instructions
- install and set up an IAC driver and make the software synthesizer listen to it
As described above, a synthesizer is the thing that actually makes the sounds for you.
For Macs, typically the easiest solution is SimpleSynth. You can download and install this program and keep it running in the background at all times. This will give you a basic set of standard MIDI sounds for Audacity to work with.
You can download SimpleSynth for free from this external website.
Once you have installed SimpleSynth launch it and keep it running in the background.
Virtual MIDI port
A virtual MIDI port is a piece of software that runs in the background to send/receive MIDI messages from other programs or hardware devices.
The IAC (Inter-Application Communication) Driver in macOS allows you to create virtual MIDI cables between applications in this case Audacity and the software synthesizer.
You are likely to have to install and configure the IAC Driver on your Mac: 1) quit Audacity
2) Open Audio MIDI setup using
3) You should see the drivers setup window
4) Double-click on the IAC Driver icon and you should see:
5) To use the IAC Driver, first you must turn it on. Click on the "Device is online" checkbox
- And then click the button.
Ready for use
This should leave you ready to relaunch Audacity, import a MIDI file and play it.