SmokeandShadow
Armchair Expert
Huh? This is my first post by the way, but I have always figured it is determined by the interval the vibrato is applied to. If a major lead run ends on, say, a C then sharping it at all would give it a minor feel (a D minor) in so much a vibrato affects the notes place musically (not much in my opinion). The rhythm plays an obvious role in dictating the appropriate note as well.
Honestly, in practice I notice whole tone vibrato must be applied with more care.
Honestly, in practice I notice whole tone vibrato must be applied with more care.