need some help with TSP2 mappings please

hi i've got TSP2 mapped up, controlling my vci 300 (Flashflooders mapping) and MF (Instant grat). The MF is working fine, except personally i'd like it not turn of other decks fx but thats not my point or question.

My question is, I'd like to map ch01.cc.025 knob to fx group, wet and dry. But only if ch01.note.d#5 has been pressed down. so to switch between this new mapping and the cue mix already assigned to that knob.

with this new mapping it'd leave the current wet and dry mapping redundant allowing the current knobs to just be the filters

It may be all down to multipliers but i've never been good at them. always conflicts etc.

thanks