Possibly up for trade is my MXR Bass Octave pedal. Note this is the older discontinued 2 knob model, not the more recent 3 knob.
Does what you would expect, adds a low octave to your sound. Lovely warm and organic tone, unlike the sterile digital octavers. Tracks well down to G sharp, doesn't really know what to do below that, but then again i don't know of an analog octaver that does
Got this for a good price and of course will pass that on. First guy to throw £43 at me, including first class signed for p&p, gets it.