On advice from Pianoteq’s support, I am now using MIDI-OX to re-map CC64 values 24-127 to 0-127. I then use MIDI Yoke to connect the output of MIDI-OX to the input of Cantabile.
Unfortunately it causes problems for Cubase, and I have not been able to track down the cause yet.
I personally think that the DP-10 is faulty, but will wait for Roland to respond to my query. I really really don’t want to use things like MIDI-OX and MIDI Yoke if it can be avoided at all.