Hey Tony -
I would recommend getting used to using the
smart tool, you can do most all functions with it without having to change tools constantly.
I am assuming you are talking about velocity, not volume.
To change velocities in Piano Roll View with the smart tool:
1) Click a velocity bar & drag up or down.
2) Lasso notes using right-click & drag either in the notes pane or controller pane. This 'selects' notes to be edited. From there you can adjust selected notes only by dragging a bar up or down, or delete, or cut or copy. etc.
3) Use method described by Cactus in post above.
By default, SONAR shows one controller pane which is Velocity.
If you want to control Volume, you must add another controller lane & choose 7-Volume.
As Cactus mentioned, volume & velocity are different.
Hope this helps, happy Friday