Boss

Lush, Rich Chorus, Optimized for Bass Frequencies
Don’t forget the bass! The CEB-3 Bass Chorus is one of the best effects pedals for bass that we’ve ever heard. Designed specifically for the low end, the CEB-3 Bass Chorus pedal allows bassists a greater freedom of expression, for a more compelling sound. To avoid muddiness, you can control the effected frequency range by using the low-filter knob.