HP Pavilion Dv6-7138us Audio :: Tone Controls Apply Button Grayed Out

Under Control Panel, Sound, Speakers and Headphones Properties, Tone Controls Tab, the Apply Button is grayed out for my Bass/Treble settings which reset to 4 every time my PC restarts if I change them. I cannot set the Bass/Treble levels permanently where I want them (Bass - 4 and Treble - 0) because the Apply Button does not work. I have two identical models of this PC with the same problem - both HP Pavilion dv6-7138us with Beats Audio and AMD cpu. Can the Apply Button be fixed? The Beats Audio Control GUI (also in Control Panel) has Bass and Treble settings that remain where set.Perhaps Beats is overriding Sound in Control Panel? I have a boxed Windows 7 32-bit installed on another PC and Sound has different control options - no Beats Audio. I would think if Beats modifies Sound controls in Control Panel, those controls should work. Otherwise, the modified Sound controls would not be there unless they are there in case Beats Audio is uninstalled or disabled? I see no way to uninstall or disable and have no desire to uninstall. IDT Audio is listed in Programs and Features.