Got an octave pedal recently - the Electro Harmonix Octave Multiplexer.
Have been trying it out with various Cigar Box Guitars.
It's good to take busking so I can add some bass without taking a bass instrument with me.
A few weeks ago I tried it with a Diddley Bow I made in 2011, with lots of distortion (from the Boss OS-2) and LOVED the sound!!
Played it at Hot Numbers open mic in Cambridge the other week. Got some video of it, but as it was so crowded my cameraman/husband had to film from behind the speakers, and it didn't really capture the feeling, so thought I'd do a video of it at home.
The song is called "Is Anybody there?" and a more basic version of it (no beat and pre Octave pedal!) is on the album "Playing (No Rules)" album which is available here http://bemuzic.bandcamp.com/album/playing-no-rules
For the beat I'm using a home made mic, made with a DM-13 mic capsule (cost about a fiver from Maplins) stuffed into an old Wasabi Peanut tin.
On the pedal board I've got, left to right - Boss RC-20XL Loop Station, Boss GE-7 Equaliser, Boss Overdrive/Distortion OS-2, electro-harmonix octave multiplexer, Boss chromatic tuner TU-3.
At the back is a Morley A B switch and an Eneloop pedal juice which powers it all.
For pics and more details about the Diddley Bow and Bob Harrison pick up go here http://www.cigarboxnation.com/photo/albums/didley-bow-with-bob-harrison-lone-star-pick-up