i use a bass whammy to "change tuning" on my bass. i play four string basses tuned to drop C, CGCF. we have a few songs a step lower in drop A#, A#FA#D#, that i used to switch basses for when playing live. our latest record has a song where the guitar players tune with a low G, GGCFAD. i was trying to figure out how to approximate the bass sound for that song live to avoid having to bring out another bass for one song and tried several different octave pedals. i ended up liking the octave down harmony setting on the bass whammy the best out of everything i tried. then i tried pitch shifting the drop C bass down a step for the drop A# just to see if it would work, and ended up liking it so much i stopped bringing the drop A# tuned basses out. so, it works for me and i love it. i was looking at having to take 5 basses on tour, and the whammy lets me take 2 instead and i don't have to change basses at all during the show anymore.