Keyboard included on PS-3100 but I hear some improvements were made on later ones. These synths apprear to use an independent VCO for each of the 12 notes and divide down/condition the signal for each lower octave. Resonators and VCF are then used to modify the harmonic content. Sample +Hold and 2 LFO's (well..up to 1khz! not so low! but 'lower' :-) ) for modulation, and also having their own modulation VCA. "Voltage Processors" allow headroom limits on modulations. An ensemble effect can be introduced also. So a very different subtractive synth anyway.
I hear of lots of problems. Usually one of the keys has stopped working. Thus one of the oscillators has broken or the path that get's it to the mix somehow. I'm yet to see one of these around here. SOMEONE SEND ME ONE so I CAN FIX IT AND PLAY WITH IT! :-) I'm also told that one common fault on 3200's, is on the edge connectors going intermittent like the polymoog. The dividers also fail Peter Blackett tells me. Assume that is also the case on 3100?
I believe you'll draw mostly blank looks from Korg on these units. I have some parts that are the same so feel free to ask what the current stock is on a given thing. Some of the less common parts are getting quite hard to find though. THings pop up on ebay now and then..Watch for scammers though. A favorite in the past of someone to post obvious scam auctions. Contact