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2. Your adapter may not be the proper voltage/amperage. If the adapter has ratings listed, make sure they match the keyboards ratings.
3. Try it with the headphones. If they work and the speakers don't, you've narrowed down your problem. There may be some damage or wiring problem within where the board meets the speakers, and/or before processing.
4. Try it with batteries. If that works, you need a new adapter.
That is NOT touch response, but velocity sensing. Each key has two contacts and one closes before the other to facilitate measuring the key velocity. In your case, it sounds like the key you are holding down has a bad disconnect diode in the key matrix and is holding the "first contact" signal true so the next key senses max closure speed. If you are not electronically adept, you need to take it in for servicing... however first tip the thing and vibrate it as some contamination MAY be shorting a line in the key matrix. Staples and paper clips are notorious problems with keyboards when they get into the key area.
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