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Leaving the unit switched on for a while is a possible approach ... The other thing to try is a system test, initiated by turning on the power whilst pressing the +1 and -1 buttons simultaneously. I tried the system test you suggested but, as I feared, nothing happened at all. I think the problem ...

Thanks for your reply. ... It could be that the electrolytics need reforming. This is best done by gradually increasing the mains supply voltage, over a period of hours to days. . As you can imagine, I don't have the necessary equipment to do such a thing. What about leaving the unit "normally ...

I own a Korg 05R/W module I bought back in the early nineties, which I used frequently for a few years (at home) before starting to use virtual instruments. I remember having turned it on once, some 15 years ago, just to hear its (beautiful) sounds again, but after that I left it always on the shelf ...