“Up for auction is a Teenage Engineering OP-1 keyboard with a non OEM power adapter. Everything works except the volume knob, which is
is stuck at half the volume. I got this this instrument like this and it really hasn’t been much of a problem for me, but you can buy the replacement board for about $50 on average (here on eBay or elsewhere on the internet, such as iFixit). Note: the volume knob can be physically moved, but it doesn’t alter the sound. All other knobs and buttons work fine.” Click here to search for synths on eBay
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