This dialog box’s function is to change the continuous data value of every note in the selected region by a percentage of its current value. Because it changes the data of every selected note by a percentage, the Percent Alter command preserves the relative proportions of the existing values.
When you select Continuous Data from the MIDI Tool menu, a dialog box appears in which you can specify the MIDI controller or wheel data you want to edit—pedaling, patch changes, pitch wheel, and so on. In this case, the number in the Percent Alteration text box specifies a percentage by which you want that controller’s values multiplied for all the selected music. The Percent Alter command isn’t relevant if you’ve specified a non-continuous controller such as the sustain pedal or a patch change; it may be useful, however, if you want to increase the degree of pitch bend or monophonic aftertouch by a uniform amount for every note in the selected region.
MIDI Tool menu
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