The Boss BF-2B Bass Flanger is an analog modulation pedal specially calibrated for bass frequencies, adding rich, swirling flanger effects while preserving strong low-end clarity. It uses four simple controls — Manual (sets delay center or static position), Depth (sweep intensity), Rate (LFO speed), and Resonance (flange feedback) — to shape a variety of sounds from subtle movement to dramatic jet-plane sweeps. The design maintains the fundamentals of the bass tone, with rugged build quality and buffered bypass typical of Boss compact pedals.