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For the sake of brevity, try powering down. Then, power up holding the last note on the keyboard, Some models use this as a factory reset feature, but then again you haven't mentioned the brand or model...
Here is where you can get the service manual:http://celedoniaorgan.netfirms.com/cosco/nfoscomm/catalog/product_info.php?products_id=1021&osCsid=3eaaa99d6bfceeaaf9b844687ba58d55 Since the problem is with the foot pedal note and the keyboard note I would suspect that there is a problem with the tone generation circuit for that note. You might try cleaning the key contacts on both for that note first to see if that works. The volume pedal probably just needs the volume pot cleaned with contact cleaner spray. I hope this helps. Let me know if it does.
Sometimes the keyboard has a mode that splits for upper and lower part of the keyboard, usually splitting at the F#/G. Also CERTAIN voices will ONLY sound one note at a time. Piano setting would not have this problem of course.
When you play a single note does that sound? If it doesn't in the fingered mode, then there may be a processor problem in the unit/
If it does, there is probably a problem in the matrix that scans the keyboard electrically. If one of the keys were ELECTRICALLY stuck on, the processor within could not read whole sections of the keyboard.
To troubleshoot the problem, press exactly one key at a time... do they all work for say a piano voice while in the fingered mode.
Next press a key at the high end of the keyboard and try others. See if you can find an octave that fails to work.
The problem is likely imbedded in the electronics and could be anything from a dirty key contact to a cracked circuit board. It is NOT likely you can fix this yourself unless you are experienced in electronics.
what is make and model? I have owned several keyboards, with 2 of them Korgs in which I would connect a damper pedal. I noticed that when I help down the pedal, after so too much input within the cpu of the keyboard, it would 'short-circuit' and sound like I had played an 'off-key'
If you have been using the damper pedal, and even if you release a little on up on it, but not all the way, the 'off-keys' will still sound. I must always make sure the pedal is placed in a position that my leverage action of my foot will completely 'release' the overtones still being processed by the keyboard (whether they're audible or not)
Do you cover the keyboard when not in use as small particles of dust can make their way in between the keys?
You can try blowing any obstruction out with a can of compressed air, may solve your problem.
As I'm not familiar with this Model, does the keyboard have 'touch response' on board? If so there will probably be a 'Contact' strip made out of tubular rubber under the keys and this can sometimes 'burst' especially on a certain key that is played most of the time. For example if you play mostly in the key of 'G' or keys that use that note....