One of the synths responsible for the sound of the 80s, the ESQ 1 is beloved by the likes of John Carpenter, Steve Roach, and Skinny Puppy. I have tested it inputting to Ableton and it worked well, however if you are planning on creating your own patches and saving them to the unit, it will need a new battery ($20 part) soldered into the board which is a fairly straightforward process and I can show you where to get one if you're so inclined, hell I'd probably be willing to help you with the project. Comes with the original pedal and the expansion module as well. Don’t hesitate to reach out if you're interested!
From retrosynth.com "The ESQ-1 is a mid-eighties analog/digital hybrid synth featuring digital oscillators with analog filters and VCAs. The unit has numerous envelopes and LFOs, with a great number of modulation destinations. The overall sound is pretty beefy, and can range from DX-like bell sounds to moog leads to evolving pads. This is an enormously powerful synth which is often overlooked."