ADA MP-1 is a preamp, solid State cleans and Tube overdrive channel, MIDI controlled and responsible for lots of late 80s and early to mid 90s sounds.
I do believe I have one of those in my backup rack. It's in storage atm, and the bigger unit is sitting behind me atm having been retrieved from said unit 2 weeks ago. The DSP21 isn't in the rack with the 120 and 2112 though so not sure where that is lol
https://ibb.co/xf44Z6Y