I have a question for the amp guys. I do lots of fly dates and consequently I am usually playing through rented backline and the amps are almost always new fenders, either DRRIs or some kind of Hot Rod. Sometimes they sound good and sometimes they really don't. My question is this-how big of a difference does bias make in this situation? Is it worthwhile to learn how to bias these things? And what is the best way to go about doing this on a nightly basis? I have room to carry a multi meter but not too much more than that. I have not done much work on amps buy I think I know a couple of techs who would show me. Thanks for your help.