Hi...I'm missing something here!

UFX receives analogue 1&2 input (Test tones from CD player).  With Totalmix as stand alone or via Reaper, i cannot lower or mute the normal output volume to my speakers....xlr analogue outs 1&2......only the front volume control works?

This is with all outputs at infinity and muted in Totalmix?

what have i not understood?

advice gratefully received