Boss OC-2

The OC-2 Octave pedal lets users fatten up their sound by adding two additional tones--one and two octaves below the original note. Each tone has a separate volume control and plays back with outstanding clarity.

Compact octave pedal that produces tones one or two octaves below the original note--or both
Separate OCT 1 and OCT 2 controls, as well as Direct Level control for exact tonal shaping
A classic effect for guitar and bass