I've had an MXR Envelope filter for a little while that I bought simply for a recording project. I've liked it okay, but was never blown away by it. Kept it around anyway for fun every now and then. Didn't dislike it enough to sell it either. Well, I just got an MXR BOD (which I love), and when I turned them on together...WOW! They both just seemed to come to life together in a wonderful funky tone. Fat, funky, and full of life! So, that got me thinking... what other pedals (make and models), in your opinion, have you discovered compliment each other REALLY well (or you were surprised didn't work well at all together, for that matter).