A
Atterion
New member
Just purchased my second Korg POLY-61 (1982). And suddenly she is having some problems. For those who aren't familiar, Poly-61 was the successor to the Poly 6, and featured fully analog voice circuits, with digitally controlled voltage oscillators. No MIDI. My guess is this is going to be most likely a voltage or component level problem.
Symptoms: After say 30-45 minutes or so of playing, it'll suddenly freak out and sustain the lowest C-Note on the keyboard regardless of anything (And at what appears to be a lower cutoff frequrncy). Changing the programs and even switching it off then back on makes no difference it will sustain that note (The note is still sustaining when powered back on, and it does change sound accordingly with program change though). If I put it in Mono (Chord Memory) mode I can stop it from doing this, but then it breaks up making random noise, as might be indicative of a bad contact on the keyboard. As a side-note, when I bought it the lowest C note had dirty contacts. I have thoroughly cleaned the entire keyboard (Every contact etc.), and made sure the wires were all secure (Ground, voltage leads etc.).
Here is the tricky part. After it does the second little freak out, the 6th voice module starts malfunctioning in poly mode. This is a 6 voice synth, and each voice is triggered in succession 123456123456123456 etc. even if additional voices are not needed, each new note triggered, utulizes the next voice numerically. The sixth voice sounds very low, like the cutoff is being turned all the way down every 6th note (Like earlier with the sustaining note, but with lower volume than before). Putting the synth back into Mono completely solves the problem (Because only the first 4 voices are used). And eventually after switching programs around for a few minutes and putting in and out of mono mode, the synth will start operating fully functioanal again, for another 30-45 minutes.
As a possible hint, it seems to be triggered when the max polyphony is hit, and it defaults to that low c note even if my hands never even came near it. And there is no sign of physical damage to any of the internal components or circuit paths. Any guesses here???
Symptoms: After say 30-45 minutes or so of playing, it'll suddenly freak out and sustain the lowest C-Note on the keyboard regardless of anything (And at what appears to be a lower cutoff frequrncy). Changing the programs and even switching it off then back on makes no difference it will sustain that note (The note is still sustaining when powered back on, and it does change sound accordingly with program change though). If I put it in Mono (Chord Memory) mode I can stop it from doing this, but then it breaks up making random noise, as might be indicative of a bad contact on the keyboard. As a side-note, when I bought it the lowest C note had dirty contacts. I have thoroughly cleaned the entire keyboard (Every contact etc.), and made sure the wires were all secure (Ground, voltage leads etc.).
Here is the tricky part. After it does the second little freak out, the 6th voice module starts malfunctioning in poly mode. This is a 6 voice synth, and each voice is triggered in succession 123456123456123456 etc. even if additional voices are not needed, each new note triggered, utulizes the next voice numerically. The sixth voice sounds very low, like the cutoff is being turned all the way down every 6th note (Like earlier with the sustaining note, but with lower volume than before). Putting the synth back into Mono completely solves the problem (Because only the first 4 voices are used). And eventually after switching programs around for a few minutes and putting in and out of mono mode, the synth will start operating fully functioanal again, for another 30-45 minutes.
As a possible hint, it seems to be triggered when the max polyphony is hit, and it defaults to that low c note even if my hands never even came near it. And there is no sign of physical damage to any of the internal components or circuit paths. Any guesses here???
