DC. in an interview he did with premier guitar a while ago he claimed to have changed to the OBD-3 around the early 2000's.
The Compressor could be used for increased ridiculous sustain, especially with feed back stuff (ie Roman Bird Dog).
They've been using delays for ages, prior to the Aqua Puss he used Boss delays like the DD7 or DD4, they use delays for things like POTRE live.