The Octamizer adds a tone that is one octave lower to the original bass signal
Controls for Octave Level - Clean thomann Level - Octave Filter - Clean Tone
With Gig Saver function (signal transmission even when the battery is low)
Can be operated with a 9 V battery or a mains adapter (not included in delivery)

https://www.amazon.com/Aguilar-Octamizer-Octave-Effect-Pedal/dp/B009FTWFM8