we ended up using the visual I said in my earlier post for our show this year. we made it kinda like a wave. bass one takes his left hand over the drum and then I take my left hand over the drum and then vise versa with the other 3 basses down the line at the same time so its like a criss cross thingy. we are just playing 2 unison notes so it looks pretty cool, plus we are marching in double time backwards

one thing I've discovered with bass is that it's hard to do good visuals that will make you guys excited to have just done them and make the crowd excited to see them. a visual that my bassline did is the "jump-lean"(as my bassline called it) when on a unisen hit you kinda lean toward the crowd and half jump(it's hard to exlpain but it looks awesome if done correctly)
of course the suicide drop or reaching overtop(or behind) and playing with both hands on the same side, are a bit more difficult to do but look sick.

RCC's indoor bassline 07 did some crazy stuff. As did Cadets 06. Blue Knights are pretty cray with the visuals too

A good ol' bass flash can do the trick.

youll get arrested.

BD 08. nuff said. Although that stuff doesn't actually happen in real life.

Yea, that trick came from the scotch bands. They only march one bass, and I'm pretty sure its not 14 inches wide, its slim. (I'm pretty sure at least, If this isn't scotch style correct me) And its just like a flourish, except for the bass. The players left hand goes under the bass and hits the right head, and the right hand goes over the top to hit the left head. I'm pretty posative its scotch basses that started that trick, But I don't want to say definatly and get punked later.

check out phantom 08 bass line http://www.youtube.com/watch?v=0zuzb3WXmMg
they have some subtle but swweett visuals my bass tech marched 06-07 PR and 08 Rythym X