soundblaster z - high gain option missing ?

[ppapath]

Hello everyone , i have Soundblaster Z , and it supposed to have an option to change impedance to high gain 600 ohm for my headphones . But the option is missing from my control panel , i have my headphones connected directly to the soundcard headphone jack. Any suggestions ?

 

[Devarsh]

Maybe you have to install the drivers for your Soundcard. Or maybe some software is needed to do that.