Thank you Ross,
it's not a problem that I can't solve somehow, but I'm not sure to get the point: in some presets swells/drops occur even if the effect is engaged for the first time, or program change happens after the 5 seconds lapse of time which you refer (I have always SPILL ON, DSP+Effect bypass, stereo OUT). It seems to me that the issue is related to some algorithms or particular presets, but sincerely I've not been able to recognize a regularity in that. Maybe also I'm missing something!!
In any case, thank you for the support! We will wait next update.