MIDI Tool/Percent Alter

When you choose this command, the Percent Alteration dialog box appears, in which you can increase or decrease the values of the specified MIDI data type (velocity, durations, or continuous data) for all selected notes by a percentage of their original values. You could make the key velocity for every note twice as high, for example, by specifying an increase of 200%.

For detailed information, see the following dialog boxes.

Percent Alteration - Key Velocities

Percent Alteration - Note Durations

Percent Alteration - Continuous Data
Percent Alteration - Tempo