Looking at getting one of these, but I have AKG 712 headphones which have an impedance of 62 ohm, which I understand isn't enough to trigger the headphone amp to switch to high voltage (above 150 ohm it automatically switches from 1.25v to 3v). The problem is these headphones are notoriously hard to drive, so I was wondering if anyone knows if there's a way to switch the voltage higher in software?