I use a rather low action, smallest possible relif, fresh, light gauge (.40-.120) strings and SOME distortion from my ebs valvedrive.
I would not call my attack light, but it sounds a lot more agressive than it actually is.
With a good fretwork even a low action is perfectly usable and does not really limit your dynamics. There is also a added bonus - the bass I have set up this way is REALLY comfortable.
Here is an example (marcus 4 jazz, ampeg cl and a sansamp psa 1.1.):
http://fatbellyfamily.pl/downloads/marcus.mp3
it was not played that hard and sounds plenty agressive to me.
And a darker tone:
http://fatbellyfamily.pl/downloads/bep.mp3
my mayo be5 gothic, ampeg with tweeter off, and 1 mic only. Also played with a relatively light touch - sounds good to me. Some folks think that they really need to dig in to avoid getting lost in a mix - our songs have preety dense arangments with lots of keyboards and guitars and that particular light-gauge-low action setup seems to work the best for me.