spamisevil@shaw.ca

I bought a launchpad and am trying to get back some Max skills but this one has me stumped. I'd like to make a momentary MIDI switch into a latching Max switch using matrixctrl.

The User 2 bank of the Launchpad sends out a noteon when you press a pad, and a noteoff as soon as you release the pad. So it's just like a keyboard in that respect. But I want to use it as a matrix controller, turning processes on (MIDI processes in Max) and then turning them off later. In other words, I want Max to interpret a first noteon as an on command to turn on a process, and the very next time it sees the same noteon, I want it to turn the process off. And because I want to keep track of which processes are on and which are off, I am using the matrixctrl object. But I can't figure out a way to do this! I tried using stripnote to get rid of the noteoffs, and, for the sake of design they are perhaps not necessary. I'll give an example of what process I want to do here assuming stripnote has removed noteoffs.

For those who are familiar with Launchpad and Ableton LIVE, this is essentially an imitation of the functionality of the session and mixer modes where you have visual feedback on what's on and off in LIVE.

I've attached the patch that works fine in momentary mode.

52 127 - process x on
66 127 - process y on
77 127 - process z on
52 127 - process x off
44 127 - process a on
66 127 - process y off
etc

For those who are familiar with Launchpad and Ableton LIVE, this is essentially an imitation of the functionality of the session and mixer modes where you have visual feedback on what's on and off in LIVE. 

making a momentary MIDI switch into a latching Max switch 4.6