My newly purchased minibrute worked just fine for three hours, then it started producing a note whatever I do, and I can't make it stop. I can alter the note's pitch by pressing any of the keys, but even with the arp turned off, the oscillator turned completely down, the sub osc off... It keeps going. I've turned the synth off, removed the power supply, still it keeps playing when I turn it back on. It plays at the rate of the LFO and I can alter that rate, but everything else has stopped working.
What is going on and how can I "reset", sort of speak?
I'm not an experienced analog synth-dude, just a poor gnome from Norway, trying to make some bangers. Please help!