I have been trying to work out a recording program and see what I can get out of my effects.
Here is one result. All of the parts are played with a SX fretless fiver. The 'guitar' parts are run through a HOG, a Holy Stain for its' dirt, and then an English Muff'n. I was pretty happy with how guitar-like it sounded (not that I'm getting hired to run a studio anytime soon

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PS if you can run a different effect chain for your 'guitar' and bass, then it really adds to the two instrument effect. Bi-amping or blending will get that done.