MIDI-CI
MIDI-CI is part of MIDI 2.0. It allows a sender to receive information from a receiver. MultitrackStudio supports MIDI-CI for MIDI Out Devices (see External MIDI Instruments).
Note: on Windows, MIDI-CI currently isn't available. See Windows MIDI Services.
Bidirectional connections
MIDI-CI requires a connection in both directions. A bidirectional connection is detected automatically for USB MIDI 2.0 class-compliant devices. On Mac, this requires macOS 14.
MIDI-CI can also be implemented by MIDI 1.0 devices. In that case, the bidirectional connection consists of two traditional MIDI ports. You can select a MIDI-CI Bidirectional Return in the Studio → Devices window by right clicking a MIDI device box.
Tip: MIDI-CI connections are re-initiated when the Devices window closes. You can do this if it has stopped working.