I have FoxPro sounds on my Fury and Shockwave. I also have Bob Aronsom (Sp?) sounds. On most of my crow shoots I start off with Dennis Kirk's "Sentinel Crow" which is just a "Caw, caw, caw" sound. FoxPro has this type of sound. If I want to fire them up I play "Crow Come Here" by Johnny Stewart which really gets them excited.
IMO if you fire them up too much or use an owl decoy you'll get a flock to come in, you'll shoot a couple of times, and then have to move on because you burned out that spot. I don't have enough spots to run and gun so I camo up good, use a blind, pass up shooting at bigger flocks, and stick it out in one spot for half a day picking away at singles and small bunches. It can be a lot of fun and a lot of shooting.