For those that use a rack and/or head: Do you ever have a problem with rattling noises coming from your rack when placed directly on top of your cab(s)? How do you solve this? It seems easy to say "put it on a nearby table", but I find on smaller stages that I'm lucky enough to have room for me....and usually stuffed in the back....sound familiar? I once saw a DJ isolate his turntable by using tennis balls cut with a flat side to keep them from rolling. I've wondered if this or maybe something like soft rubber(hockey pucks??...hey I am Canadian after all....Go Leafs Go!!!) would work. So, what do you guys do? Thanks for the feedback.