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I'm using the Yamaha Montage 7 as Master Keyboard when I use Reason 9.5. If I push down the sustain pedal when I play a instrument of the Reason, the velocity of instrument is highly increased. When I used this sustain pedal with other master keyboard, it was ok. So I think it is not a problem of my pedal.

Please let me know if you have any idea about this issue.

It probably isn't your pedal. More likely it is the montage that is not sending the right midi CC. Check which input you put the pedal in, and make sure it is sending CC64.