[keyframes] audio volume curves don't allow amplifying the volume
@jeff
Submitted by Jeff F.T. Assigned to Jeff F.T. @jeff
Description
The current implementation of keyframe curves for audio sets 100% = the height of the clip. I'm guessing that it could be better to have 100% volume = 50% of the height of the clip, so if you want to make it 2x louder, you raise it to the top of the clip (200% volume).
But then I'm not sure, perhaps this "amplification" thing is something that doesn't belong in curves, but in a clip's properties pane (to be able to set arbitrary values) or in the layers' volume slider (if there's one).
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=589820