Boss OC-3 Octave Pedal (see Mike Dawes video) - sold
 

If you've seen the Mike Dawes video of how he uses the polyphonic setting to add only the low end for a deeper acoustic sound, this pedal does it.

See it here: https://youtu.be/rQf-cM6X8GE

In excellent condition, in original box
sold

Price dropped to $75+ship

before i played 7 string, this was the pedal i used to pump up the bottom end.
someone will really like this. give it a chance

I'm game.
Sending a pm.