The Launch Control 3 has a few MIDI interfaces, providing two pairs of MIDI inputs and outputs over USB. They are as follows:
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MIDI In/Out (or first interface on Windows): The main interface used to receive MIDI from the users Custom Modes, and to provide external MIDI input.
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DAW In/Out (or second interface on Windows): This interface is used by DAWs and similar software to interact with the Launch Control 3.
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To DIN Out/To DIN Out 2 (or the third and fourth interface on Windows) These interfaces are used to send MIDI from a host to the DIN outputs of the Launch Control 3.
When using a Custom Mode, you can enable each of the two DIN MIDI out ports and the Main USB MIDI In/Out as the output for surface-generated events, independently or all at once. Each output can also, optionally, merge the stream of the DIN MIDI in port into it’s output.
If you wish to use Launch Control 3 as a control surface for a DAW (Digital Audio Workstation) or DAW-like software, you will want to use the DAW interface (See DAW Mode in the main user guide).
Otherwise, you may interact with the device using the MIDI interface.