Mac Audio MIDI
BlackHole is a modern MacOS virtual audio driver that allows applications to pass audio to other applications with zero additional latency.
Mac : combine multiple audio interfaces
- Combine multiple audio interfaces by creating an Aggregate Device : https://support.apple.com/en-us/HT202000
How to send MIDI from Ableton to WebMIDI (Mac):
- Run the built-in OSX app called 'Audio MIDI Setup'. Select 'MIDI Studio'. Double Click 'IAC Driver'. Then check the 'Device is Online' checkbox.
Go to Ableton -> Preferences -> MIDI. At the bottom for 'Input: IAC Driver (Bus 1)' enable 'Track' and 'Remote'. For 'Output: IAC Driver (Bus 1)' enable 'Track'.
Now in the the Ableton midi track you want to send notes from, Select 'IAC Driver' as the midi output.
Mac IAC driver
Ableton virtual MIDI bus
- How to setup a virtual MIDI bus : https://help.ableton.com/hc/en-us/articles/209774225-How-to-setup-a-virtual-MIDI-bus