I picked up a Boss AW-2 Auto Wah today. Well, it's pretty old (and it was used), I don't think they make it any more. It's quite interesting: overall >> VERY SUBTLE, you can only just tell its there, good for adding a bit of funk where it otherwise wouldn't fit. doesn't suck low end much at all, great considdering it's not a bass effect Controls: (Rate)(Depth)(Manual)(Sensitivity) can wah up and down (manual control >> "hi" to "low") the trigger works, but when it isn't being triggered, it oscillates (up and down over and over) leading me to the coolest part of all: I put my fuzz in front of it, and set the sensitivity low so it never triggers and just oscillates. Then set filter to taste, and instant tremolo/synth sounds. Just use the rate control to speed up or slow down the oscillations. Overall, very cool. Get one or at least try it if you can.