[linux-audio-user] tool for bass testing

Hello, I have a few friends that are heavily into their car stereos with the heavy bass. They have all sorts of CDs (bass mechanik?) that have some cool techno loaded with some heavy hitting low frequency bass. This got me curious, and since I can't find anything on Freshmeat or Google (or just am not using the right terms) I was wondering if anyone here knew of such a program that can generate some nice smooth bass. I have played with one of the drum editors (the popular one? cant remember the name) but of course it didn't seem to have any lower frequency generating drums. If anyone could point me to something like this I would be greatly appreciative! Thanks, Bryan