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How do I daisy-chain MIDI devices in Audio MIDI Setup?

Since MIDI interfaces with many ports are very common now, you shoudn't need to daisy-chain your devices.

But if you have an interface that does not have enough ports to hook up all of your MIDI gear, you can daisy-chain two or more devices to one MIDI port.

Note that to do this, all of the MIDI devices that are daisy-chained to a single port must be able to respond to more than one MIDI channel. On each device, you may want to turn off its response to all but one MIDI channel (choose a different channel for each device daisy-chained together). See in the screenshots below how the synth can receive on MIDI Channels 1-8, and the drum machine on MIDI Channel 10.

In your Audio MIDI Setup, create and configure your MIDI devices as you normally would. Since in Audio MIDI Setup external devices cannot be connected to each other, each daisy-chained device will need to be connected directly to the MIDI interface.

For example: If you have a synth module and a drum machine that you want to daisy-chain to one output port on your MIDI interface, draw a connection from that output port directly to the synth and directly to the drum machine (see screenshot below). You would then physically connect the output of that MIDI port on your interface to the synth's MIDI In, and connect the synth's MIDI Thru to the drum machine's MIDI In. Now in DP 4 you can select either your synth or your drum machine as a MIDI output—just remember to choose the correct channel for each device.