She lovvvvvvves sustain. Other than that, I'm not sure, either. She uses a Moog Taurus in her home studio, but live Tim usually plays this rather than Amy (whether he uses his own, or borrows Amy's, I'm not 100%). I think most of her effects are inbuilt since you don't see many cables other than XLR/jack/aux leads coming out of her Roland and the Baldwin rig is all very self contained (I swear it's like a Tardis in that thing). Honestly, other than that, it's a bit of a mystery. She rarely gets asked about her instruments in interviews and it's always difficult to see a keyboardist's pedal setup with all of the stands etc. in the way, anyway.
Other than that I'd recommend anything which makes your sound 'milky' if that makes sense. Reverb/sustain/echo are all a big part of Amy Lee's signature sound.
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