I would like to buy a bass whammy pedal. I know there was a digitech pedal made for bass. It is still available on ebay and other for sale sites but is way overpriced. I have seen some write that the Digitech Whammy V is okay. I have seen still others write about the Eventide Pitch factor with expression pedal. I want to create the intro sound on the The Black Keys-Lonely Boy. There is a pretty significant difference between the price of the digitech pedal and the Eventide Pitch Factor plus expression pedal. But I have some cash saved up and only want to buy this stuff once.
I use ps6 before it works for whammy effect but dont recommend it if you use it as pitch shifter. http://m.youtube.com/#/watch?v=mhJmkJQAFd8 if you see the band here the bassist uses PS 5, during the bridge to outro.