Virtual MIDI devices overview in Logic Pro for Mac

Logic Pro for Mac includes two virtual MIDI devices, called Logic Pro Virtual In and Logic Pro Virtual Out. You can use Logic Pro Virtual In to receive MIDI messages from another music app, and use Logic Pro Virtual Out to send MIDI messages from Logic Pro to another music app on your Mac.

Logic Pro can receive MIDI messages from another music app on your Mac by selecting Logic Pro Virtual In as a MIDI output destination for the app.

You can send MIDI messages from Logic Pro for Mac to another music app on your Mac by choosing Logic Pro Virtual Out as the MIDI input.