Maybe I'm on the wrong site, but my CLP920 model has really rattly keys, which annoys my partner in the room below when I'm playing. I only realised how bad this is at a funeral service last week, where a guy played Dance Macabre' on a Clavinova without a single thump or rattle (and I was standing beside him)! It's the whole keyboard, not any specific keys
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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...
Try checking your power cord. Perhaps someone stepped on it and it pulled out. It happened to me once. I thought something was terribly wrong with it. I was pretty embarrassed to find out that I'd just cut off power via cable... check your cords before worrying too much. If nothing seems to be wrong, take it in to the repair shop.
Get replaceement keys from Yamaha America (musical instruments). Search Google for the phone number in California. You will need the model number and the key position that is broken and maybe the SN of your unit. Download a service manual for instructions here: http://elektrotanya.com/yamaha_psr-e213_ypt-210_sm.pdf/download.html When you go to this site DO NOT click on the download button but wait a minute for "Get Manual" to appear in the BOTTOM RIGHT and click on that link. You will get a PDF file of your SERVICE manual that has everything you need to understand how the keys are attached. BE VERY CAREFUL when opening the unit as there are tender ribbon cables between to two halves of the case. The manual probablly has a part number for the key in the parts list.
Check the rubber contact pads below and swap with working ones for a test. replace if necessary. If the faulty ones are in a patten, replace MKS board attached below the keys unit. some old models d require CPU replacement. Whats your model?
We can only guess what keyboard you might have. Maybe it has built in speakers or requires external speakers.
Usually on the keyboards there is a headphone jack. The jack disconnects output if headphones are in. Some keyboards have mute functions. Some use rotary volume controls, some use sliders... The controls can become damaged causing problems.
We don't have ESP to know what model you have and can give no further help without the model number. Always post as much detail and tests you have run.
There is no way to make a low-end keyboard model a Mini Moog decently.
You probably need to get up into the $1000 to $2000 range to get decent modeling of the analog synths... Go to a music store that has used equipment and maybe they can find an older analog synth that can get close. Maybe try to find a DX7II or other unit but be aware it takes talent to tweak the sounds where you would want them.
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)