Boss VF-1 Effect Processor

I've got a Doepfer midi controller plugged into my VF-1 and I map 
midi channels to effects parameters, the only drag is the 4 modulator 
limit. Does anyone know any tricks to get around this?

BTW, the Doepfer midi controller works really well with the VF-1, 
it's really handy to map delay feedback, tempo, filters.

http://www.doepfer.de/home_e.htm  (check out 'pocket control')

-Steve