Little BIG improvements

A list of small changes that can have a huge impact on workflow.

a) Option to invert direction of shift+scroll wheel.

b) Extend markers to have the line cover the whole track view (like every other DAW) *along with it and the chord track,etc being visible in editors.

c) Ability to change voicing in the chord track itself.

d) Ability to see grid lines in variaudio.

EDIT:
e) Ability to snap cursor to closest grid line when locating by clicking on empty space.