Here’s what you need to do if the file you’re playing in QuickTime isn’t loud enough and the volume slider is already at the maximum position.
From a 20-in. aluminum iMac to a 2.4 GHz, 15-in. MacBook Pro (2008) and 2.93 GHz iMac (2009)
From a 20-in. aluminum iMac to a 2.4 GHz, 15-in. MacBook Pro (2008) and 2.93 GHz iMac (2009)