Heya [H]. I have a pair of Denon low impedance cans plugged into a the dedicated headphone amp on my Auzentech HTHD. The issue is, there appears to be no way to control the volume of the headphone amp jack when the phones are not in use. I run my speakers at 50%, but that results in the cans being crazy loud. If I kill the speakers, I can hear them from across the room. I can mute the speakers when the headphone is connected, but can I somehow mute the headphones when they are not in use? Since the amp connection is on the rear I/O of the card, it's a hassle to plug/unplug the phones everytime; it's just not practical. I'm hoping for a more elegant solution.