I was looking for a monitor controller to use with my RME HDSP 9632 (which is a pci soundcard mounted inside the computer without any outboard volume control), and after some research I found this!
It delivered. Very sophisticated, clean look, the knob feels extremely solid, the mute and mono switches work as expected.
I use it with XLR cables for input and output, but noticed there are small stereo input and outputs, I tried to put my headphones into them, weirdly I get no sound out of the output, but I get it out of the input (!?), all though I can't attenuate this signal with the knob. Not sure why this would be so. It would actually be a neat feature to be able to have my headphones connected simultaneously and attenuate the signal with the knob.
Oh well, might be me misunderstanding something.