| Bass,
If you want your bass to be heard in the mix, find out whether other band members might be "trespassing" on the freq range that you'd like to occupy. If such trespassing is occurring, perhaps you can get the fellow member to change the EQing of his or her instrument to help you "cut through".
Personally, I believe that my bass can be heard better at our live shows now that I've recently convinced our electric guitarist to attenuate his low end somewhat - and I've changed nothing about my bass sound or approach. I believe that this has improved our overall sound.
Listen to studio cuts of Metallica when you get the chance. The guitars and drums seem to occupy the entire freq spectrum - there's little room for the bass which makes Cliff's and Jason's lines hard to discern!
I like Metallica's unique brand of metal, but I think it would kind of be a tough gig for a great bassist because there's not much space for you there. | 
