Adding to the stoner rock parade. Would absolutely shit myself if someone made a Dopesmoker custom. (Or, failing that, a bass chart for Sleep's "The Druid". *drool*)
The thing with bass is that it's an instrument that requires more of a "feel" to it. A lot of the bass charts are very simple to hit every note in, but if you heard yourself play the same bassline outside of the game's context, with your bass isolated from the rest of the music, you might be shocked at how much worse it sounds than you would've expected. (But gosh, is it fun)
My, uh. My bass recording rig is extremely hi-tech. http://i.imgur.com/zRlIGNr.jpg (It's obviously not very good, but it gets the job done for quick demos)