ARP Quadra

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via this Vemia listing

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"Rare ARP Quadra in near mint condition.Serviced and working perfectly. Runs on 240V power. Arp Quadras were famously used by Tony Banks Genesis and John Carpenter. Im based in Bristol and arrange delivery to UK and Internationally. Heres some info from about this classic synth on Vintage Synth explorer... The Quadra is pretty much a hybrid version of ARP's Omni II and Solus synths. It's a four-section synthesizer consisting of a Bass synth, Poly synth, Lead synth, and String synth. It is quite good at emulating each of these sounds and can function in any of its four modes at a time with the ability of layering the different sections! Sounds you create in any of the four sections are instantly recalled from memory by the push of a button! There are 16 program patches for storing your sounds. Other major features are the incredible phase shifter, tons of balanced audio outputs for each section, dual portamento controls and a superior arpeggiator...that's pretty good for 1978! On the downside, it has a fragile mylar front panel, very limited programability and a weird feature that autotunes the keys to play weird intervals. The Bass synth section is monophonic and can be programmed to occupy the lower two octaves of the Quadra's 5-octave 61-note keyboard. The bass sounds pretty good and has 16' and 8' presets each for Electric and String Bass sections. The string section is based on the Omni II String synth. It sounds excellent and implements a phase-shift effect that is sort-of like a chorusing effect that thickens its already great string sound. In Polyphonic synth mode there are more effects available such as sample-n-hold and the phase-shifter. String and Poly Synth sections have 8' and 4' Polyphonic Waveform Generators each along with a preset called Hollow Waveform. In Lead synth mode the Quadra becomes a two voice screamer with aftertouch sensitivity in the upper octaves of the keyboard! It's duophonic (like the Odyssey). Get a bass sequence going, switch over to another section and play along! The Quadra is a synthesizer well suited to live performance use and has been used by 808 State, ELO, Genesis, The Human League, Pink Floyd, New Order, Nick Rhodes (Duran Duran), Joe Zawinul, and film-maker John Carpenter."