you can also use a technique called ducking, where you send the bass to a compressor. here is a some copied text on that
"Ducking is often used when doing voiceovers. It allows background music to automatically be turned down whenever a external source, such as an announcer's voice, begins to speak. You can also use ducking to have one instrument push the other out of the way, such as the bass guitar ducking every time the kick drum hits.
To make the compressor into a ducker, plug the source into the inputs and plug the trigger into the sidechain. The Sidechain return (the ring connection) isn't used in this example. In the example below, the sound of a radio announcer's voice will automatically turn the music down when he speaks and it will slowly fade back in after he stops:
Set the compressor controls like this:
* Threshold set for +3dB (around 3 o'clock)
* Ratio set for 6:1
* Knee set for Soft
* Peak/RMS set for Peak
* Attack set around 9 o'clock
* Release set around 2 o'clock
Plug the announcer's mic into the mixer, and feed that mic to the compressor's Sidechain in. When the announcer speaks, the music will duck down (turn the ratio up to duck it even lower). When he finishes speaking, the music will fade back up at a rate set by the Release knob. "
I am also a bass player so i play most of my own bass lines. Here is a great article on recording great "real" bass lines
http://www.prorec.com/prorec/articles.nsf/files/C05204C8DC2968B78625665000797D4D
anyway hope that helps someone.