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Is this the correct sustain pedal for this unit? It sounds like it should be a momentary button type. I would look into that. Some have a push to work type of switch and some use momentary. If it is, I would open that pedal and clean the switch with contact cleaner, as it appears to be sticking.
What has happened is that one of the contacts on those notes is not working properly. Each key has two contacts. One makes before the other as the key is pressed. The processor MEASURES the time between those as you hit the key to read the VELOCITY you have hit the key with. This velocity is often used for loudness on many voices such as the piano. These contacts are USUALLY conductive rubber pills suspended in silicone rubber "domes". One can disassemble the key area and clean BOTH the black rubber pills and the circuit traces they are pressed against using Q Tips and ONLY 99% isoprophyl alcohol to restore proper operation
One needs to be very careful when disassembling unit as there are many tender ribbon cables and connectors. Best to have clear work area and two people to "control" the halves of the shell while opening..
Here is a link to their support where you can download the latest operating system, manual etc.:http://www.clavia.se/main.asp?tm=Support Consider joining the forum. There are always helpful members who quite likely have experienced some of the same problems. You didn't mention if that happens when you play piano, organ or synth as the setting changes you make can affect each differently. Here is a link to the download page for Windows:http://www.nordkeyboards.com/main.asp?tm=Downloads&cldwn=Nord_Stage_EX&osdwn=osw Here is the one for Mac:http://www.nordkeyboards.com/main.asp?tm=Downloads&cldwn=Nord_Stage_EX&osdwn=osx Pages 61 and 62 of the manual are good starting places. Aftertouch can be assigned to different functions. You will need to read Morph Assign also on page 60. Page 33 explains Velocity Sensitivity which is different from Aftertouch. If the Aftertouch is not giving you enough control over a parameter, try using the Wheel or a pedal for that parameter instead. Here is a link to the manual:http://www.nordkeyboards.com/downloads/manuals/nord%20stage/Nord%20Stage%20EX%20Manual%20v6.x%20%28eng%29.pdf The Factory Reset function is on page 68.
The contacts for the dead keys are dirty and have to be cleaned. This type keyboard is NOT DIY unless you are adept at electronics. The actual contacts are accessable after a lot of dis-assembly.
They are conductive rubber that is pressed against circuit traces on circuit board.
Use ONLY 99% isoprophyl alcohol and QTips to clean both the contact and the circuit traces they press against. Clean ALL the contacts when you have the unit open as others are sure to become inoperative as well.
Try testing your switch for function by testing it with a volt ohm meter to make sure the cord and switch are functional. In this case if it is the recommended foot switch it will be momentary on or off. That is if you are using your meter to test across the plug, when you press down you should have no resistance displayed if there was resistance when you connected the probes or resistance displayed if there was none when you originally connected the probes. If the switch is good, your problem is internal to the keyboard and you will have to troubleshoot the circuit on the board. Another possibility is the solder joint has failed where the sustain pedal jack is mounted or the jack itself has failed.
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