So if anyone is keen, here's version 0.1 of my front end of GenMDM, called Genajam
https://github.com/jamatarmusic/genajam
All you need is an Arduino UNO, micro SD card reader, midi output and a LCD keypad shield. I'm using female to male prototype cables to hook everything up at the moment.
Dump a bunch of TFI files on the root of the SD card and you'll be able to select them per channel It plugs into the MIDI input of the GenMDM and then you can use the USB to send it notes and stuff.
For anyone who's keen! Otherwise, I'll be moving forward with adding full FM parameter controls and working towards a physical prototype in the coming weeks / months.