He's only so far emailed me to say that the 'panel has corrosion', that 'some of the pots are a bit noisy' but that it 'sounds 100%'. He serviced it himself a 'few months' ago and will do so again before selling.
He bought it to UK from Japanese dealer 2yrs ago, hasn't gigged it and has mostly kept it shut in case in studio.
I love the sound (in web vids) of these unusual single-osc synths.
But have you found panel corrosion hard to cure before please?
