A while ago there was a report on a German synth collector/musician in KEYBOARDS magazine in which he described this problem. He had some decoupling capacitors replaced which fixed the problem -- maybe someone could look up more accurate details?
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Stephen?
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Gesendet:?Samstag, 09. Januar 2016 um 18:18 Uhr Von:?"fanwander@... [yamahacs80]" An:?yamahacs80@... Betreff:?Re: [yamahacs80] HIgh Pitched Whine