Yeah, go for it. Its not like the white stripes have always sounded terrible live, or anything...

Don't do this.

If you want a bass tone invest in a cheap bass guitar. Playing a bass line on a guitar sounds like crap, regardless of the amount of effects you apply to it. Either re-write the songs to feature a heavier and more prominent rhythm part or get the actual instrument and have one (or both) of the guitar players pulling double duty.

Switch a guitarist to bass and get a synthesizer, which you can take turns to play.

Why didn't I think of that. :D

Was just giving the OP some vaiable options.

It would sound terrible. I don't call that viable.

I just finished a song that has NO bass in it, and I used a "Mock" bass sound from a guitar. It doesn't sound terrible at all. But that is certainly my own opinion.

Believe me, if it doesn't sound like crap, it'll be a first as far as I'm concerned.

Judge for yourself:

SoundClick artist: PRD Ideas - page with MP3 music downloads

The above doesn't sound bad at all, and I've heard other people do it and it sounds just fine. So long as you're not trying to make the "bass" part too prominent in the mix, it should be okay at doing its job. I've attempted to resort to this a couple of times when I was just too lazy to grab my bass from a friend's house. I didn't end up liking any of it, but I did find it convenient enough to just stack an additional guitar behind the lead and give it a heavier sound.

Thats just it. The main guitar riff in that piece serves as the bass line as well as the rythm, and is not real prominent but lays low for a backdrop.

...and thanks.