via this auction
"For sale is an Arp Quadra, one of the rare vintage analog synthesizers. It's a super cool synth with very unique tone and layout. You hardly ever see these up for sale and if you're reading this auction, you've probably been already been waiting a good number of years one of these. This particular unit has some issues and is sold as-is for parts/repairs. Please read below for a full description and additional pictures. 
Cosmetically it's in near mint shape. Looks absolutely amazing. The graphics are crisp and very little signs of use all around. Functional it has some issues but it should be fixable in the right hands.
After extensive testing, here's what's working:
Powers on, all keys trigger properly, sound outputs from the main 1/4" outs on the rear.
Moving from left to right on the panel:
Portamento working
Bass section: All sliders work, Elec Bass 16' and 8' work. The Strings bass 8' works but only on occasion, and the 16' does not seem to activate.
Strings section: all parts working
Hollow waveform: not responding when pressed
Poly synthesizer: 4' is working, other parts of this section temperamental and not fully working
Phase Shifter/Output mixer: All sections appear to be working as they should
Lead Synthesizer: All sections appear to be working as they should
Programmable Voices: All buttons 1-16 respond with changing LEDs and changing sounds, though some patches do not sound as exciting as others, likely due to corresponding sections not being fully functional.
In general it could use a tuning/calibration and some sliders show scratchiness and are a little on the stiff side, but still easy enough to move. Any features not mentioned above have not be tested.
Considering there are some functional issues, this unit has to be sold as-is condition, for parts/repairs with no guarantees on its functional condition. It can be shipped with the included flight case or packed without the case into a very safe cardboard box with many layers of bubblewrap (which I personally recommend from experience as it cuts the weight down and keeps the synth extra protected). In any case I'll do my best to pack it safely for the trip."
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