I get pseudo-synth sounds the weird and hard way with squareish wave fuzz, digital octave up or suboctave (sometimes fifth), and sometimes setting a wah to squash the sound just right and either keeping it there with my foot or moving it up and down for a filter effect. Occasionally I'll use phaser too just to swirl it around a bit.
I like it all to be able to used individually without midi presets while still being able to control the expression pedals. Obviously it's not the same thing though. I did have a lot of fun playing with the EXH bass microsynth though.
Yeah I blame Chris Wholenstomeworthsmenshire (Wolstenholme?)or however you spell his name, from Muse. So many otherwise unwanted pedals suddenly shot up in value because of all the stuff he used, from the Akai to the Russian Muffs, etc...