Sony Vegas 9 does not have a keyboard short cut to do the equivalent of right click on an audio clip, select Properties, then Normalize, which makes a faint audio louder and audible. SV9 does not seem to have the ability to add keyboard shortcuts. So Aldo’s Macros comes to the rescue. It is a great tool from https://www.AldosTools.org/macro.html Records the keystrokes of Shift+F10 (shortcut menu), P (Properties), Alt+N (Normalize), Enter (close dialog). F12 is the default for the currently select Aldos Macro, plus you can define more. Then you can simply select the section in the audio track, then press F12.