I use a ukulele with an under saddle passive pick up. Will the BodyRez do the same thing for a ukulele as with an acoustic guitar?
The BodyRez is primarily designed for use with piezo pickups. Since your ukulele has a piezo pickup on it, it should certainly benefit from using the BodyRez. Check out the BodyRez with your ukulele at your favorite dealer.
Using the BodyRez with an electric guitar