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Hello, You may want to reset your machine, all data and pre loaded programs, for this you must turn on your M50 press the global mode button, click on the top arrow next to (basic) select option 2, load pre-preloaded demo data, you then choose all (PCG and demo songs). press OK. Your Korg will re install all factory samples, data and settings. Once completed It will then instruct you to turn off your machine. give it a minute or so to self upgrade before turning it back on, once you turn it back on you should see updating panel notifications right and left, you should be able to use all of the sounds and combi's available for M50. that's a factory reset. I hope this helps, Have a great day.
1. disconnect the AC Adapter to the 3030 (Make sure amp volume is all the way down)
2. While holding the STORE key down, reinsert the AC adapter to power back on. (..AL.. will flash on the display, indicating that the 3030 is standing by for the 'All Initialize' operation.
3. Press the STORE key again. The All Initialize function will be executed, and the Play mode returned. To cancel All Initialize function, press EDIT key. This cancels reset, returns to Play mode.
Sound banks does not define what keyboard you might have... HOWEVER... THINGS TO CHECK: Check if the bass MIGHT have a transpose set by mistake. Also check if pitch bend might be active... some keyboards can use a pitchbend pedal... We can't guess what brand or model keyboard you have. Batteries are NOT anything that would cause this. Remember that on a keyboard there is a LIMIT to the number of sound generators that are available and you can run out of polyphony with mass layering. The last thing might be any "effects" you have activated. It sounds like you can split this keyboard so separate transpose MAY be possible that low end is transposed while upper is not...
Check if you MIGHT be in a "guide" or learning mode. Some Yamaha synths have a mode that will play and then wait for you to hit the right key before moving on. If this is not the problem, a fix is not DIY and will require repair. I assume you are NOT using MIDI as in that case it is called "dreaded MIDI drone" and is due to data looping back into the unit which is an external fault.
Pianos do NOT respond to keys pressed hard... they respond to FAST presses. If you have an issue with the piano, first go on record to activate your warranty. Most of these electronics DO have a setting that adjusts the "feel" which affects the loudness versus key velocity... Now here is a secret??? Shh... The manufacturers turn up the demos just like the advertisers turn up the commercials on the TV... I would suggest looking for the adjustment of feel, and if that doesn't get satisfactory results, find another and compare yours to another... if yours is still underperforming, exercise your warranty for repair or replacement.
TIP: All buttons must remain depressed and be pressed in the order mentioned in step #2 for proper execution.
2) Press and hold down the [SEQ] button, then the [CARD] button (located next to the Demo button), and then the [DEMO] button.
3) Continue to hold the buttons down until the dialog box appears in
the display. The display will first indicate the V50 Test Program and
Main Rom Version then will automatically display the question: 'Test
4) Press the [DEMO] button. The screen will display: 'Factory Set?'
5) Press the [+1/YES] button. 'OK' will appear beneath the 'Factory
Set?' readout, indicating completion of the Factory Reset, and the V50
will automatically return to Play Mode.
This is likely a problem in the scanning matrix of the keys and switches. Other than opening the unit and looking for contamination like a metal shard or a loose cable, it is unlikley you will be ablle to repair the unit yourself. There could easily be a metal part shorting something that is causing the problem, but it could also be a bad IC someplace in the circuitry or even a cracked circuit board.