The OC-2 is a basic octaver that can produce a two extra tones in additional to the original tone. The first is one octave below the original tone and the second, two octaves below. The level of each octave’s tone can be adjusted independently. The Oc-2 has always been popular with both guitar players and bass players. To get a steady and reliable sound from the Octave, it is recommended that you keep your action high and that you have absolutely no fret buzz on your guitar. It is also an advantage to use a compressor in front of the OC-2 to limit the dynamic range that the OC-2 has to work with.