# Sequential Circuits Pro One
“This synth is in VG+ cosmetic condition and all of the electronics work fine. They have the classic Sequential sound with great filters. There is however a problem with the keyboard, which is you have to hit the keys very hard (especially out of “drone” or continuo mode) to get them to play. We therefore are selling this with the following understandings: (a) A perfect application might be just to use the electronics without the keys, there are CV and gate inputs on the back. (b) You might try to clean the keyboard contacts, we sprayed them with ChemWash but that didn’t seem to do much, there may be some problem with the electro-magnetic connection. (c) You might unhook the keys from the synth engine, they’re only attached with a ribbon cable, and get a new set of keys, use the synth engine to augment another Pro-One, use a different set of keys, or even rack mount it ala Studio Electronics. (d) You could just bang the keys hard!” Link