I teach a class in a 30 machine emac lab running panther. Is there any way to set the speaker volume of a machine using a terminal command (over ARD etc.) E.g., setvolume 30 for 30% volume etc. If not are there any console utilities available that do this? ...Also, is there any way to simply completely mute the computer speakers only allowing for headphone use, without having something plugged into the headphone jack 100% of the time?