“RAREST of the RARE: ARP Odyssey Mk I (Late Model 2800-1974-5). This is a two-oscillator analog synthesizer, and one of the first with duophonic capabilities (the ability to play two notes at the same time). This allows you to get that wonderful “guitar-like” distortion when used with Distortion/Flange effects.that bands like Ultravox used to good measure as a lead synth.
I used this in my home studio back in the day before it went into temp-controlled storage. NEVER USED ON THE ROAD/GIGGING. Smoke-Free environment always. Hence the museum quality condition. Please look at the pictures-Even the slider caps are all original!
I just had a full, cost-no-object service completed by one of the top analog synth techs in the USA (see some of the sample parts replaced in last pic): Trim Pot, Filter Caps, Sliders, etc. – Including a full set of Key Guides – so plays AS-NEW! NOTE: This is not a Mark II, even though it is Black, not White. Late models were done like this, hence there is no CV/Gate on back panel. Like I said, Super Rare. ” Click here to search for synths on eBay
“Original legendary duophonic ARP Odyssey MKIII in great working condition. The last of the original series including the four pole resonant 24dB lowpass “moog” filter!” 
“Up for sale is this ARP Axxe.
“For your bidding pleasure: 1977 ARP Avatar Vintage Guitar Synthesizer with Pickup / Cable / Footswitch / Manual / Promos. Used but not abused, some sliders are a bit ‘sticky’ but work. Unlike most Avatars this one works great, sounds great and tracks surprisingly well (better than any I’ve heard). It’s important to find the sweet spot when mounting the pickup. You get the Avatar, original pickup, original pickup cable, original footswitch, original manual, original service manual with fold out schematics, and original promo literature with flexi record. Guitar not included. “