using the HD Pods live seems to be a popular subject/ problem on here.

  I have seen a company website www.atomicamps.com that makes active guitar valve powered wedge monitors that a are specially suited to amp modellers.

         As they are full range (like a P.A. speaker) they would require amp and cab sims to be on, not off, so maybe this would erase the problem that we all seem to be getting with the Pod HD  simultaniously running into a PA (via XLR) and guitar amp (via LINE OUT) at the same time.