It IS possible!
from the manual page 42, that is page 50 in the pdf:
PARAMETER SLIDE
The PARAMETER SLIDE menu makes it possible for the parameter values of two separate note trigs or trigless
locks of a track to slide between each other. Open the menu by pressing [FUNCTION] + [BANK D/H]. When
this menu is active and [TRIG] keys are pressed, slide trigs will be placed on the sequencer.
For a parameter value to slide between two trigs, it needs to be locked on one of the trigs. A locked parameter
value will slide to the unlocked value and vice versa. To make the parameter value slide, place a slide trig on the
same sequencer step as the trig whose parameters you want to slide. The speed of the slide is relative to the
current tempo and the slide is completed when the next trig is reached. Several parameter values can slide at
the same time.
•Parameter slides can be quickly added to note trigs or trigless locks. Keep the note trig or trigless
lock pressed and press [BANK D/H]. A parameter slide trig will automatically be placed on the
same sequencer step as the note trig/trigless lock.
• Press a note trig/trigless lock to quickly see if a parameter slide trig is placed on the same
sequencer step as the trig. If that is the case, the <BANK D/H> LED will light up.