A.
In order to eliminate the input monitor signal arriving at the UA-101's INPUT 1--10 jacks from the monitor output of the headphone jack or the monitor output jacks, set the direct monitor volume knob to full left.
This will mute the input monitor.
You'll get only the computer's output signal on the headphone jack and monitor output jacks.

Related FAQ: JP05-10016
(2005/06/22)