BNody size relates directly to all aspects of sound, not just volume. Trebles, Basses, balance.........Also, for various types of styles, body designs are quite useful in getting what you want. You ain't gonna' do much Bluegrass with an O and you're not going to get the clarity of trbles with a D. They are simply different tonal qualities, all else being equal. The best balance is generally agreed to be found in the 0000 series, followed by the OM.

Spaw