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Old 2012-09-23, 00:25
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pushedbutton pushedbutton is offline
 
Join Date: May 2009
Posts: 5,589
My midi sustain pedal has a reverse polarity switch which would have this effect. Maybe you have a loose connection on it.
To see if it is a hardware problem you could unplug the offending pedal and use the shift key while you have the on-screen keyboard loaded up. If that behaves as expected I'd be looking into replacing or repairing the pedal.
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