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chorus

+1 to what Eric said!

If it's a good chorus that retains the low end (most of them do... it doesn't have to specifically say "Bass Chorus" to work on bass), it will "fatten" your sound through the doubling effect. Chorus pedals simulate multiple instruments playing in-sync by overlapping the bass signal with a slightly-detuned copy of that signal.

Just think of the violins in an orchestra. They usually play together for an awesome effect. That's a multi-voice chorus right there!

Most chorus pedals are two-voice (original signal, effected signal, mixed together). Some can do more voices (like the Digitech Bass Chorus, with multiple effected voices).

Octavers can also "fatten" your sound if they're the type that overlaps your bass signal with a second signal that's tuned down one octave (or sometimes, two octaves). You might not be looking for this kind of pedal, though.

It really all depends on what you mean by "fatten". Heck, you could also "fatten" your sound with some EQ adjustments that favor low mids and bass frequencies!
 
Im actually thinking about getting an octave pedal to fatten my sound. I dont like how the chorus alters the sound. I just want to retain a basic sound that is fat and steady. I already have a limiter both on my amp, as well as a pedal, so im just looking for something to add some strength to the tone. I can also use my limter pedal as an enhancer to spice up my tone.
 
I'm going to go with sparkle over fatness myself. I use mine when I need to add an aqueous sound to whatever it is that I'm doing at the time.

If you're looking to beef up your tone, an octaver is probably what you want.

That being said if you DO want a chorus pedal, get an Analogman one! :D
 
Also: distortion users can greatly value a chorus before their distortion. I run the Boss CEB-3; I cut most of the lows out of the 'effected'-part (filter control @approx. 10:00-10:30). I run it between a GK Deisel Dawg set on light overdrive, and an ODB-3 set for 'buzzsaw' (gain cranked). This gets-me a Trower-like tone.

I like it a lot...

Joe
 
My favorite way to fatten up tone is to have an envelope filter set to zero sensitivity. This basically deactivates the envelope part and just leaves you with a what is usually a dubby sounding filter (think Bill Laswell).

Most envelope filters can do this pretty well regardless of how good they sound normally -- I've finally found a use for my Digi BSW.

I don't like the sound of a chorus and don't always want to go an octave down, so this is the perfect solution for me.