A lot of linestages have multiple outputs that are controlled by the main volume control. I used the second output to run a multichannel ambience recovery/synthesis processor that creates 4 additional channels of information to simulate a large soundfield. The same could, in some setups be accomplished with a splitter instead of multiple outputs, but, the multiple outputs is a neater solution. Unfortunately, my current linestage does not does not have multiple outputs and splitting the single output results in less than optimal sound.
