Well, you have one volume knob. You can set that volume knob to control any combination of 1/4 / XLR / Digital outputs. So what I do is control the volume of my monitor, and leave the other output to FOH at unity. So, the answer to your question is, yes, you can set the volume knob to control the 1/4, and leave XLR at unity for FOH and let the sound guy control you from there. Go into your global settings and you'll find it.
See post #33 of this thread. Not the original patches, which would be nice to have, but they are the patches he is using now so I'm imagining improved.(?)