Select the notes in the Piano Roll View by clicking the key in the keyboard or lasso the notes then either
position the mouse cursor above one of the notes until the cursor changes to a stylus with a histogram above it. Then CTRL+Click drag to adjust all selected note velocities. This will changes all notes by a certain amount.
or
right click the clip in the track view and select from the context menu select
Process Effect > MIDI Effects > Cakewalk FX > Velocity and Set To a value. Read move about the Velocity MFX here
http://www.cakewalk.com/D...ngMIDI.44.html#1086150 BTW, you can save some time by using the User Control Panel above and adding your hardware, OS and DAW to your signature.
edit: fixed url