Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

Hi Rae & Johannes, You are definitely on to something. I can see from monitoring the power supply voltages that the "modulation" symptoms occur while the voltage is increasing up to 5v after turning the synth on and disappear when a stable 5v is reached. This takes a significant amount of time (1 minute+) when turning the synth on from cold and a split second when turning the synth on when warm. I tried the KLM boards connected in various combinations and found that the 5v supply is indeed being dragged down....by the KLM366 voice board. There are no obviously faulty electrolytic caps on that board (no noticeable bulges, corrosion or goo) but as they can drag drag voltages down and replacing them is cheap and easy for me (I have a vacuum desoldering gun) that is what I will do next. I will then report back. Many thanks to you both.