The micro POG is a truly fantastic product, it tracks perfectly on my 4 string Bass (EADG) both for the octave down as well as up. But here is the issue, the sound is amazing "IF" it is the sound you are looking for. if you are looking for an absolute true rendition of the note either one octave down or up, then be careful as the POG lends a very tuneful and slightly "organ" flavour to the note. Utterly cool if that is what you are looking for, but for me it was not quite what I was expecting. I also tried it on an electric tenor Ukelele with a mix of clean and sub octave, what a funky sound ! So, just be aware, the Micro POG is a superb tool creating some fabulous sounds, but it does have its own "colour". It is definitely going to get some use with the Ukelele, which was probably a million kilometres from the designers mind when they created it !!!