You could smooth each of the EventValues in the parameter fields, for example:
!Freq1 smooth: !Slew s
Alternatively, you could save a large number of random presets, then use an InterpolatePreset and smooth the !Interpolate control
!Interpolate smooth: !Dur s
Then when you roll the dice, it chooses a random preset and moves all EventValues to it over the course of !Dur s