I had a similar problem with expression pedal (Korg EXP-1) - the full travel of the pedal would send CC message over a very small range (like 120-127) instead of the full 0-127 range. At first I suspected a defect, but after some googling found out it was simply wrong polarity. I just had to swap the tip and the ring of the TRS connector, and voila! Works like a charm...
hope this helps,
Boris.
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