| I use a treble booster on bass sometimes. First of all, most treble boosters will cut your low end a lot. I use an Analogman BASS Beano Boost, which gives you the treble booster sound, but is a lot more friendly on your low end.
But the main purpose of a treble booster is to push a tube amplifier or an amplike dirtbox to get a distorted sound. It does make your bass sound more guitarlike, but if you're going to put it in front of just a solid state amp, it's probably going to sound like crap. Also you want to be careful about running buffers in front of a treble booster, it's a vintage style effect and is meant specifically for use with passive guitars and for you to plug your guitar straight into it (true bypass pedals in front of it won't do it any harm though; I use a true bypass wah in front of my treble booster when I use it).
But moreover, you can check out some of the dozens of soundclips I have done on this forum, and many would agree I achieve a very "guitarlike" sound with my bass, and to be perfectly honest it really has more to do with my pickup selection and how I play than what pedals I'm using. What you really need is a "guitarlike" sounding pickup (I use my SG Bass's bridge pickup) and to play with the same sensibilities a guitar player would (be assertive). But of course a guitarlike sounding pedal can help too, check out my Fulltone OCD soundclips (do an advanced search for threads with Fulltone OCD Soundclips in the thread title).
But if you are curious for soundclips of treble boosters on bass do an advanced search for "treble Booster soundclips" or "beano boost soundclips" and you'll find that I have done soundclips for a couple different treble boosters on this forum. | 
