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Oh, and I checked the power. Everything according to schematic: 3.3v, 9v and 4.5v

Ok, I reflowed and checked every pins, it doesn't help. But I found, that the top row of knobs effect on the sound though. So still, maybe I can check fv-1 without soldering? I slowly loose my faith, hope you can help me somehow))

Thanks, I'll try it

No, top row of knobs not effect on the sound. And yes, clean guitar signal is alright.

Hi. Well, "Octogon" not working, just makes strange noise. I checked everything, analog part working properly, seems there's trouble with fv-1. So maybe I can check fv-1 without solder it off somehow? And yes, I bought it much earlier in other shop.