4
votes
6answers
11k views

Master volume control is grayed out

on my Mac 10.6 (MacBook Pro Late 2009) master volume control for both Line-In built and for external USB Microphone is disabled (grayed out) Nobody really wanted to help what is the reason and how ...
4
votes
2answers
2k views

Multi-output MIDI device disables volume control

When creating either an Aggregate Device or a Multi-Output Device in Audio MIDI Setup and setting it as the default audio output device, the volume control is greyed out and locked at maximum ...