I have always heard that buzz is caused by one or more wires not being tight enough on the reso head. Make sure all the wires are tight when engaged.
Hmm...that's a new one. The snare wires are real old, and not in that great of shape. I'll look closely for any bent or loose wires. Probably should just get some new shiny ones, maybe those puresound enforcers that John mentioned.
Thanks tinman!
Brian