[LAU] Aceptable bass guitar sound: is it possible?

Hi List! Inspired by the great article: "Making great guitar sounds on GNU/Linux" from Arda Eden (great rig of effects, very good guitar sound, and really well explained, thanks!), I've been thinking about a problem I have since loooong ago :) I have now a good (and 100% free) platform to record/mix great guitar/drums sounds, which is *almost* everything I need, but I am not able to get a decent bass sound in Linux yet. Before, when propietary soft was all I knew ;) I had some VSti or even efects to low down an octave a guitar sound to simulate a bass (not too nice, but enough if well played and equalized). So my question is, what do you recomend to get a decent bass sound (appart from buying a bass, of course ;) is it possible?? I think there are two possibilities: 1) I read Arda Eden uses Hexter DSSI synth, and sound well, but I don't have a midi controller, and have not experience with Rosegarden (I only use Ardour, no midi at all). Is there a simple host to DSSI hexter plugin which can be played/programed with mouse? 2) Any good-quality-FX to convert my analog guitar playing into a bass sound out there?? (I don't even need real time). Thanks very much! :) P.S. You can hear the things I do with my actual system at: http://virb.com/spes