Fourths is an app for OS X which makes Novation Launchpad as a MIDI controller with a possibility to play notes in fourths, scales, fixed steps etc. It creates a new MIDI port to your system which you can then connect to your favorite DAW.
The app is in beta stage, feel free to try it. I have only tested it with the “original” Launchpad but it might work on newer launchpads too. I dunno. The software is provided really “as is” as it is a beta version.
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Download here: Fourths for Launchpad