. yes, it's possible to modulate FF parameters via the audio input bands... i wrote a module that uses two effects (one for high, one for low freq) on a layer. it's rather ugly (forces effects on only layer 2 iirc) and is sitting on my laptop right now, but i'll post it once i clean it up a little.
. i used the filter (layer) module to print out all of the effect dictionaries, then grabbed a few of them and put them in an array of dictionaries. then, i created a parallel array of high/low values (b/c it some effects like pixellate just look bad running from 0.0 to 1.0 - so, i'd limit it between 0.005 and 0.3) and scaled down the modulation a little bit.
. i recently used it at a rave as an 'auto-vj' when i needed to step away and get another beer!
-james
(a nomad. )