Santa got me a Novation Launchkey 61 MK3 this year. I learned playing piano as a kid on a Yamaha PSR-340 and have been wanting to get back into music for a while now. These days, good low-priced MIDI keyboards and great-sounding virtual instruments are available for low prices, so the up-front investment is much smaller than back then.
I wanted a MIDI keyboard with a display and a couple of buttons and faders so I could select and control virtual pianos, synths, and organs on my computer. I also wanted integration of the controls with Apple Logic Pro. Some older MIDI devices used binary plugins for this purpose (which get installed into /Library/Application Support/MIDI Device Plug-ins), but with Apple recently having switched from Intel to its own custom Arm processors and many manufacturers not providing updates in a timely manner, the better way going forward is using Lua scripts.
Browsing through the Thomann store, I found that my criteria are met by the Akai MPK 261, Nektar Panorama P6, Novation Launchkey 61 MK3, and Roland A-800 Pro. (The Nektar Panorama T6 might also be okay once the manufacturer delivers the update promised. Same might go for the Novation SL MKIII if it gets an update.) The Nektar Panorama P series only has a binary plugin for Logic Pro, but a Lua script for MainStage. The Novation MK3 has a downloadable Lua script for Logic. The Roland A-PRO series and Akai MPK series are apparently supported out of the box through Lua scripts. There is also the Roland Fantom 6, a high-end synthesizer, that has a binary plugin for Logic and a Lua script for MainStage.
When you are not recording, but just playing virtual instruments, a DAW like Logic Pro is overkill. That’s what Apple MainStage is for — it hosts Audio Units (virtual instruments and effects), but unlike a DAW it has no concept of recording or timeline. After seeing Roland’s and Nektar’s documentation on their support of MainStage (they display all the on-screen controls on the keyboard display and allow you to interact with them via the knobs, buttons and faders), I wanted to see how much I could do with the Launchkey. It has special MIDI messages for all kinds of things and should thus be able to do most of the same. The Lua scripts that configure MIDI devices are installed into ~/Music/Audio Music Apps/MIDI Device Scripts (for Logic) and ~/Music/Audio Music Apps/MainStage Devices (for MainStage). The Lua API is not documented publicly, but can easily be deduced by poking through Apple’s own scripts, which are in /Applications/MainStage 3.app/Contents/Frameworks/MACore.framework/Versions/A/Resources/MIDI Device Scripts. The basic API is identical between MainStage and Logic, but Logic uses a different parameter feedback mechanism and supports multiple layers (or “modes”), both of which are not used by any of Apple’s scripts.
I am happy to report that I managed to create a complete MainStage integration for the Launchkey that pretty much matches what Roland (Fantom) and Nektar managed to do. Of course, due to lack of a graphical display, it’s not as nice, but it only costs half as much as the Nektar and a tenth of the Roland Fantom. Automatic mapping of knobs, faders, buttons, and drum pads works perfectly. The LEDs of the buttons mirror the state of the UI. The display shows parameter feedback (name and value) when you move a knob or fader. This goes beyond what the Roland A-800 or Akai MPK261 do, which have a similar price as the Launchkey, but cannot display parameter information.
Note that MainStage’s automatic mapping of controls has a few bugs. My device script cannot work around these, but you can manually re-map these controls if you need them:
- The Keyboard quick-start project does not map Smart Drawbars to MIDI faders. The Tonewheel organ project template does however. You can manually map the Smart Drawbar controls though.
- Smart Faders are not mapped to MIDI faders. You can manually map the Smart Fader controls.
- Instruments that have Smart Controls spread across multiple pages only have their first page’s controls mapped. You can manually map the Tab 2 Smart Knobs though.
- Drumpads on the keyboard trigger notes in the C6-B7 range and are mapped to MainStage’s Drum Pad controls. However, the virtual instruments expect notes in the C1-B2 range. You can manually change the trigger notes on all 24 drum channels.
Check out https://github.com/mkuron/launchkey-mk3-mainstage if you want to use your own Launchkey MK3 with MainStage. The versions for the smaller (25-key, 37-key, 49-key) models are untested, but should work just as well.