check first on sound setup, in the sound setup menu here:
try to set some parameters as needed and see if it will change the digitone’s response to the pitch bend. other modulation should follow in the same category as long as DN is receiving cc, but KSP midi implementation of the touch strips is not very flexible, so see if you can successfully make pitch record in live recording mode by setting pitch bend depth etc. first, before you try to set up the modulation parameter.
manual page should be 29 and 30 if you’d like to take a look for yourself aside from the screenshot.