For some reason when playing with a MIDI Keyboard when I press my sustain pedal it doesn’t work in Dorico: no pedal lines appear and notes appear as if I released them quickly without taking into account I was still holding the pedal when recording. The keyboard itself reads the CC64 message whenever I press it correctly (I can see it on its screen), works fine on other programs like Cubase and I even routed the MIDI out of Dorico to check and indeed when I monitor that MIDI Output from Dorico while I play on the keyboard pressing the pedal there isn’t any CC64 data. Any ideas of what might help?
I already checked that and it was enabled from the start, and disabling and enabling it again didn’t help 
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For some reason when playing with a MIDI Keyboard when I press my sustain pedal it doesn’t work in Dorico: no pedal lines appear and notes appear as if I released them quickly without taking into account I was still holding the pedal when recording. The keyboard itself reads the CC64 message whenever I press it correctly (I can see it on its screen), works fine on other programs like Cubase and I even routed the MIDI out of Dorico to check and indeed when I monitor that MIDI Output from Dorico while I play on the keyboard pressing the pedal there isn’t any CC64 data. Any ideas of what might help?
if the pedal was working before and not its malfunctioning I think that the problem could be in some of the drivers
try to reinstall everything all together and see how it goes
If the pedal wasn’t working from the beginning the problem could be hardware, did you bought it new or on the aftermarket?