Posted by surprisetalk 7 hours ago
Did that a few years back, i guess this might still be possible
Looks like they are still around? https://novationmusic.com/launchpad
Also seems to be in stock locally.
The device that I think popularized that design (citation needed) was the Monome (https://monome.org/) that looks like it is also still around and it has (always had?) some kind of open source license (https://github.com/monome).
fake edit: yes, kind of: https://www.eurobricks.com/forum/forums/topic/164622-moc-mec...
https://latedev.wordpress.com/2011/06/25/a-poker-chip-comput...