Hmm, let's say "hold that thought..."
i plugged it in, all smile on my face, and switched on the whammy side first just for a wee divebomb, and... nothing happened. flicking through the patches, i can hear it change programmes, but the expression pedal isn't working. oh dear. time for a replacement :(
i had a quick try of the droptune/capo side, and it seems to work very well indeed. but it was just a quick try, as i just packed it back up to return it. pretty disappointed, but hopefully i'll have a replacement by the end of the week and it'll be fine.