What is the best way for me to A/B test a particular DAC/amp combo? I feel like by the time I unplug the headphones and switch devices, my audio memory is already fading. Say I have a Modi / Asgard 2 plugged into one USB port of my PC and a Bifrost Multibit / V200 plugged into a different USB port and that I have them both carefully volume-matched for a particular set of headphones... Can I somehow have the headphone output from both Asgard 2 and the headphone output from the V200 both going into some sort of switchbox that has a single headphone output to my headphones? That way I could change PC output devices from Modi to Bifrost Multibit in Windows and simultaneously hit a button on the switch box to change which amp is outputting to my headphones. Or is there a better way?