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This can happen if the pedal doesn't go all the way down - so you only get half-damping.
This happens if the base of the pedal gets cracked, which is always the case with standard DS2H.
Here's an in-depth explanation of how to make Korg DS-1H or Yamaha FC3A half-damper pedal compatible with Korg SV-1 stage vintage piano: http://peter-repin.livejournal ...