So, people may not want the synth because they assume it has a lousy tracking. Fact is, a S6 with adequate warm-up will have good tracking. Patrick Moraz took one on tour with Yes for the Relayer tour, so it must be a usable musical synth. But it is true that the biggest weakness of this synth is its keyboard. It takes a good warmup to allow the oscillators to settle. But this is a duo-phonic keyboard, like the ARP 2600 it plays one oscillator above and the "A" oscillator below, when switched in this mode. Otherwise it can be a dual oscillator monophonic synth.

The S6 is well-worthy of use, though. It has a simple 2 step envelope but excessive routings of the envelope. The synth can be switched to have the keyboard, or LFO X or Y to trigger it. There are extensive modulation possibilities. The LFOs can be balanced to send more or less signal from one or the other. Both LFOs can have master speed control and the Contour (Envelope) can control speed as well. In fact this synth is similar to a 2600 in that many routings can take place in various orders. There is a Ring Modulator on this synth. Both Oscillators can be directly outputted, as can the Ring Modulator, and the 2 oscillators and RM can be sent through the filter. The filter is resonant, and it can also be controlled by the LFOs. There's a noise generator and best of all there is the external input which can be fed into the Ring Modulator and be processed easily with the filter, and because you have flexible routing of the RM, you can have the RM with the external signal and Oscillators, or with X/Y LFO's. So the only difference between this and a semi-modular synth is the presence of switches to create the routings instead of patch cords. Basically what I'm saying is that this synth is an amazing processing unit. Don't rule it out because of weaknesses in the Pitch area and the simple envelope, because there are so many synths out there that have the keyboard, tuning stability, and 4 stage envelope that will never, ever approach the complexity of sounds, space age noises and FX that this wonderful synth does with ease. Please, before you write a review try one out with a cup of coffee over a few hours. You will not only get high from this synth, but you'll be sold on it.