via this auction
 "1980 Arp Solus monophonic analog synthesizer in excellent condition. All sliders, keys, inputs, outputs, knobs and functions work as intended. The synth was regularly serviced and calibrated. The Arp Solus is light and built into it's own hard shell case, which makes it optimal for touring.
"1980 Arp Solus monophonic analog synthesizer in excellent condition. All sliders, keys, inputs, outputs, knobs and functions work as intended. The synth was regularly serviced and calibrated. The Arp Solus is light and built into it's own hard shell case, which makes it optimal for touring. 
Only 500-600 of these were made. This one is serial# 329 (2353 is the model # followed by the 3-digit serial). This was the last monosynth that Arp produced before shutting down in the early 80s.
I'm going to say something controversial - I think the Solus is both unique from and superior to the Odyssey. It was designed with synth leads in mind - probably to appeal to touring musicians who wanted a lightweight, compact synth to put on top of their big CS80s and PolyMoogs. In my opinion, the quality of sound is where the Solus shines. The design of its filter is the result of years of learning from bugs and mishaps on the Odyssey filter. The Solus includes truly explosive FM, ring modulation, and reverse envelope capabilities in place of the Odyssey's S/H circuit. The Solus' oscillators are also variable waveforms, unlike the Odyssey's square or sawtooth waveforms. The Solus is very loud and present in a mix - perfect for bass lines and leads, whereas the Odyssey sits a bit further back in a mix."

 





































