This applies to the Launchpad Pro

Launchpad Pro features MIDI In and MIDI Out via MIDI DIN.

Using the included 3.5mm jack to MIDI DIN adapter, you can now connect the Launchpad Pro to your external MIDI devices using MIDI cables.

Launchpad Pro features a 'keyboard' mode meaning you can play your synths from Launchpad Pro without even using your computer.