ARP Quadra

via this auction

"It is roughly the size of a jupiter 8 but much lighter, It consists of four sections that can be mixed together or played independently. These consist of bass, which can either be a string bass or synth bass, synth bass having basic filtering, you can get either plucky bass or wide fat bass by combining these in different ways. next is strings, which is very similar to an arp solina, although not quite identical, it is very close, and not at all like arp omni strings as some people have said. The polysynth section is probably taken from an arp omni, but that's okay because it sounds really good even though its not true poly, and it has the nice arp 4075 filter. Finally the mono synth section is a two voice synth, which sounds like a newer odyssey, you set the tuning interval by pressing an interval button and pressing the key you want to transpose the pitch to, it works well and is faster than trying to tune with a slider.

The mono synth also has some other nice featues, like a latching arpeggiator and independent glide controls, and a unique envelope. The patch memory is a bit weird, but it is useful, you can turn on and off sections as part of a patch as well as the routing, as in which parts are going to the phaser or not. Everybody talks about how great the phaser is on these things and it definitely is all the hype and then some, it is incredible, its more of a combination of flanging and phasing. the only thing i've heard i can compare it to is the obscure tau pipe phaser"