#1
I recently upgraded myself from a small 30 watt amp and a Fender P-Bass knock-off...

...to a Crate BT100 and a Squier Frank Bello Jazz Bass. I'm starting to get better tones already with this, but I want to achieve a distinctive metal bass sound without the use of a pick.

An example of a bass tone I want is in the song The Light That Blinds by Shadows Fall. Can anyone help me with this? What should I do on my amp? Do I need to buy pedals? Do I need new strings?
#2
well, firstly youd probbly get more/better advice in the bass forum. an amp like a peavy, or hartke would give a more metal tone, an od/distortion would help aswell. you could try the boss 0db-3, or an ehx big muff (or wait till the bass version is released). oh, nice choice of bass.
#3
It will be hard to get that tone with that equipment. Generally Jazz basses don't give you a "metal sound". To get a distinct sound finger style, you want to boost the low-mids to cut through. Too much will sound muddy - especially with a Jazz bass.