boss oc-2, green ringer for nasty percussive stuff and of course behringer dd-600 in the aux send. Nice thing is it takes clock pulses on the tap tempo jack
the pitch shift/harmonize effect of newer behringer mixers is also nice. Don't know how close to that the pedals are.
i use an oc-2 as part of one of my aux sends now... aux1 is ds-1 into oc-2, aux2 is sd-1
i use a boss dd-3 for delay and oscillation between songs (too poor for a 2-gameboy setup)
straight up digital preamp clipping sounds nice w/ lsdj imho