To mute/unmute notes when we make left drag mouse ( + key ) on midi notes inside midi piano roll.
In Mouse modifiers > midi piano roll > left drag mouse, this would be very efficient if we have "mute/unmute notes" option a little bite like "erease notes" option .
The workflow would be more efficient because we would have less to click or press a key to active mute or unmute.
For exemple, a simple mouse drag left + alt would be more quick and easy.
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To vote :
http://forum.cockos.com/project.php?issueid=3868
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