via this auction
Demo video in the listing posted back in 2010 here.
"ARP Quartet - beautiful sounding analog synth. The Quartet is exactly the same a the Siel Orchestra synth: ARP just licensed the design for the US market. It has "brass", "piano", "organ" and "strings" sections, and any two sounds can be combined together. The brass, organ and piano are cool and funky sounding, but this synth is ALL about the string section. Absolutely beautiful sounding chorused synth strings, in the same vein as a Solina string synth, but I actually think the Quartet strings are richer than the Solina. Everything works exactly as it should, all sliders and knobs work perfectly, all keys work as they should. There are two mods done: I replaced the flimsy and tricky-to-access "fine tune" knob with a trimmer pot. You can now set the fine tuning with a small flathead screwdriver using the trimpot. However, in the last several years, I've never needed to touch the tuning, once set it holds tune perfectly. The second and most important mod is a "re trigger off" switch to disable the voice re-triggering. Previous to this mod, if you were playing chords with a long release (which you'll want to do with the string section because it sounds awesome), and switched to another chord, you would hear the release cut off as you switched chords. With this mod, the release continues naturally after you change notes/chords, and you can get the beautiful long release on the string section that sounds fantastic. I don't know why they didn't design the synth like this, but now you have both options for re-trigger or re-trigger defeat. The ARP Quartet sound is all over the Portishead LP 'third'"
