images at this auction"This synth is a rare variation on the Pro Soloist. ARP labeled this a "digital synthesizer", but don't let that fool you--there is nothing digital about the sound of this synth. The label simply refers to the rudimentary method of patch storage, which uses some ones and zeros. The sound of this beast is full of creamy 70's analog goodness. There are few controls to alter the patches, but the sounds are really well chosen and useful, so you won't want to change them much anyway. Having a preset synthesizer on stage is advantageous; now you won't have to adjust all those sliders on the Odyssey every time you play out. Check out the pictures of the patch names--it is worth buying this synth just to select the patch entitled, "NOZE".
This synth sounds great. A few of the switches for the "Touch Sensor Effects" are not working. There is no aftertouch or velocity on the Pro/DGX; the switches simply apply an envelope to different parameters. The most important of these switches (REPEAT, WOW, and VIBRATO) do work and GROWL occasionally works on some patches. All the presets work great, as do the slider controls, though BRILLIANCE sometimes has a crackly spot if not used frequently. And, of course, the slider caps are gone."
Update via the world of next tuesday in the comments: "Actually it uses a single high frequency digital square wave oscillator that's divided down then analog waveshaped with an analog signal path, vcf and some fixed filters. One big thing that the digital tech impacts is there is no direct way I've ever seen of to control the pitch via CV. I guess you put a switch under every key though.
The presets are also recalled on a digital matrix, but that wouldn't impact the sound by itself."
