Bliptronic 5000 is an 8-bit FM synth package with LEDs for $50. 4-beat, 8-note polyphonic, one octave range (grrr), tone control, BPM from 60-180 (20BPM increments), a bunch of presets, 6vdc, speaker. Units can be chained, but …

Doesn’t sound so useful except maybe as a source of parts for fancier projects … or … trigger? controller? display?

Consider that Tenori-ons are $1000, Monomes are $1400 … DIY today cud become competition tomora.