Currently have three sets of speakers/headphones on the one amp that switch between, all requiring different volumes, which is an annoying stretch above my screens to the amp to change or via windows volume control. Ideally what I want is a small clean volume control that could sit on my desk and control the windows volume so I can leave the amp on a set volume. Does such a thing exist? Googled and the only option I could find was upwards of £30 which is too much to me for a knob... If anyone knows of anything or a easy way of making one that would be helpful.