The Poly-800 Mk.I has an issue where the MIDI buffer would overrun when too much MIDI data was sent to the synth, overwriting patch memory with random data.
I wasn't aware this also happened on the Mk.2, but it sounds like it may, from your description.
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On 10 Dec 2016, at 17:23, temsed7@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:
Good evening, everyone,I'm writing my first message on this great forum, so that maybe someone could help me.I saw this conversation while I was looking for a solution for my own poly800 MKII... I have some skills in soldering but I have been looking for a solution alone for too long...So, when I bought it, it worked well, except the switch, working even when I didn't want it to. I opened the synth, and fixed this by soldering. Then, I reloaded all the patches, and I thought everything would be alright. I played it for some days...However, some days later, something went wrong, as all my patches were kind of "destroyed", and I couldn't get any "normal" sound out of it... I can just hear strange and weak sounds, and sometimes even no sound...Let me tell you what I've done so far:- Reloading the patches several times.- Checking the battery saving the patches (this one is OK).- Looking for leaking or broken parts/components.I do not know what to do, and I'm really sad because this synth was a true source of inspiration for me...If anyone could give me a hand, that would be absolutely great and helpful!Best regards,Gloubi