[rouxroux]

Totally worthless unless in a solo situation. Other instruments in your band (bass, woodwinds, brass) are affected by heat & humidity and "tuning" is usually a constant adjustment. If a musician can not detect a "node" happening and be able to fix it instantly (and which way you need to adjust), then he/she is not that much of a musician anyway. It would be cool, however, for a solo artist, singer/songwriter-type person doing a solo gig to be able to say, go from a standard tuning to a "drop-A" without switching instruments. I usually frown at these "advances", although I do have 1 bass with the extinct Novatone "Switchboard" fingerboard option that I can carry as a "utility" instrument to sessions. I can switch from fretted to fretless in about 30 seconds and that is neat when you're wanting to "travel light".

***EDIT*** and what happens if you are "bending" or using a Bigsby or other whammy bar?