I'm hopelessly infatuated with the Meggy Jr., the fully programmable handheld console featuring an 8x8 RGB LED matrix display, but don't have the coding knowhow to actually mess with one, so for now, I'll live through the Meggy Jr. projects of others, though there aren't many.

Orbus Gameworks' Darius Kazemi, who also created a roguelike for the system, posted the above video for MeggySeqSynth, which turns the handheld into a "standalone performance device where you sequence your samples and then improvise over it using the MeggySynth arpeggiator."

The project combines the work of Kazemi's MeggySynth (a proof of concept for a rhythm game idea) and Josh Brandt's step sequencer MeggySeq. The Orbus Gameworks president also posted this clip of Jonathan Mak (Everyday Shooter) trying out MeggySeqSynth: