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The Plethora X5 can act as a MIDI slave device. This means that it can receive MIDI data via the MIDI IN to be controlled by another device. It also features a MIDI THRU connection, allowing you to pass the MIDI data coming IN from a connected device THRU to another connected device.

For example, the Plethora X5 can receive MIDI commands from a MIDI controller connected to MIDI IN for patch changes. It can also pass those same commands to another MIDI device connected to the MIDI THRU.