This extremely clean Mu-Tron Octave Divider is a vintage pedal from the 1970’s. It works perfectly. Highly desirable and hard to find.
The 70s Mu-Tron Octave Divider was a groundbreaking effects pedal that created thick, analog octave-down tones and a fuzzy octave-up tone using a built-in Green Ringer circuit. It was known for its dynamic sound, which preserved the original signal's harmonics, and its dual footswitch design allowed users to toggle between the octave-down effect, a "ringer" octave-up effect, or a combination of both, and also to kill the dry signal for a massive sub-octave sound. It included controls for mixing the effects with the original signal, a "tone" control for the sub-octave, and a "stabilize" switch for better tracking on single-note lines. 
Some notable artists famous for using it are Stevie Wonder, Jeff Beck, Larry Coryell, George Duke, George Benson, Lee Ritenour, Frank Zappa, Bootsy Collins, and many others.
Core features

• Octave-down effect: It produces a strong, analog octave-down signal that is designed to maintain the dynamics and harmonic content of the original note.
• Octave-up effect: The integrated Green Ringer circuit, a highly regarded octave-up effect, was added to create a fuzzy, ringing octave-up sound.
• Stabilize switch: This feature helps the pedal track monophonic (single-note) signals more reliably.
• Bass Only switch: This footswitch kills the original signal, leaving only the octave-down effect for a massive, pure sub-octave sound.
• Tone color control: A dedicated control allows players to adjust the tone of the sub-octave signal. 

Other characteristics

• Analog circuit: It uses a classic analog circuit, creating a warm and organic sound.
• Dual footswitches: The dual-footswitch design is a hallmark, giving the user control over the effect's status and the "Bass Only" mode.
• Versatility: It was designed for a variety of instruments, including guitar, bass, and keyboards.
• High value: Due to its signature sound and rarity, original 70s models are highly sought after and expensive on the vintage market. 

If you are a guitarist, bassist or keyboardist or just collect great vintage gear, you NEED this pedal in your collection.