That sounds much more interesting than trying to replicate a double bass with things that aren't double basses!
An EUB is a valid instrument on its own which gives lots of possibilities, and I get frustrated by all the people on this list who just want it to be a cheaper/smaller/lighter/louder imitation of something else.
(/rant, back to topic...)
Bowing through a phaser gives a didgeridoo sort of drone in one of my band's songs; I often add a bit of overdrive to accentuate the growl on rockabilly stuff, and get some really extreme funk with a BassBalls pedal - the extra dynamics and fat low end of the EUB (compared to BG) really gets envelope filters going.
i agree, i realise this is a little late in the thread but its worth sharing my experience.
ive been messing around with a gt-10b with my double bass as well as a NS cr5 and i can say that the sound coming out of an amp will never sound the same as a double bass if you use an eub, or vice versa.
the gt-10 has a solid body -> hollow emulator which i find works well with my double bass. i can get a sound coming out of the amp which sounds very much like playing acoustically. mission accomplished there.
i then set out to see if i could emulate that exact sound through the using using my ned steinberger, but it didnt happen. tonally, the characteristics between the two are very different. theres no point them trying to be one another, as they are not.
youre much better off trying to identify and enhance the natural characteristic of each instrument. i challenge anyone to say that an electric upright cant be soulful, ive heard far more muddy and thuddy double basses to know it swings both ways.
remember, amplified double basses are a mix of the amplified sound plus the acoustic sound. even pickups and an amplifier cant perfectly reproduce the sound, let alone another instrument like an eub.
and give the eub some credit too, they can have an awesome tone as well. its not a double bass and it doesnt have to pretend to be one.
some eub's do manage to come very close to a full body sound, but my philosophy is to buy something for the sound. if you want a full body sound, go for a full sized bass. otherwise accept the eub tone for what it is