Edit Window and Mix Window Keyboard Shortcuts : Clip Gain

Clip Gain
 
Control+Shift+Minus (–), Control+Shift+M, or Control+Shift+Comma (,)
Start+Shift+Minus (–), Start+Shift+M, or Start+Shift++Comma (,)
Control+Shift+Plus (+), Control+Shift+Period (.), or Control+Shift+Slash (/)
Start+Shift+Plus (+), Start+Shift+Period (.), or Start+Shift+Slash (/)