Hi
This is what I have.

Panasonic TH-P50U20Z Plasma 

Panasonic DMR-XW380 DVD Recorder

Panasonic SC-XH50 DVD Home Theatre

Desktop Computer running Win7 Ultimate 64bit

NVIDIA Quadro FX 560 video card that has dual DVI-I outputs

Sound is currently handled by the motherboards High Definition Audio Device

Watch I currently have hooked up is Home Theatre to TV using their HDMI(ARC) connections

The DVD Recorder is hooked up to the TV using the second HDMI connection on the TV

My computer's video card is hooked up to the TV using the third HDMI connection on the TV

The computers sound single output is connected to the Home Theatre's AUX input with a cable that starts with one plug at the computer and splits in to two at the Home Theatre's AUX input. 


So now that we have all those details down this is what I use this lot for at the moment.

Watch TV and listen to TV sound through Home Theatre's speakers..HDIM(ARC) works good.

Watch movies sent from computer on TV ...third HDMI works good and use Home Theatre's speakers...HDMI(ARC) works good. 

Listen to music from computer on Home Theatre's speakers...AUX input on Home Theatre works good.


So now this is what I want to do......

Put two extra speakers in different parts of house so that I can listen to music form the computer in other rooms.

Each of the two remote speakers will have their own on/off and volume controls in the rooms they are in.

What I don't want is to have to have the computer/Home Theatre set-up playing music at the same time just to be able to run the remote speakers. 

I have room to add a PCI Sound card to the computer or a USB External sound card if need.

So what do I need and how do I set this up?

I have seen this on the net....http://techdigy.com/2012/09/10/how-to-make-a-dual-output-audio-card-for-a-few-dollars/....which uses...Virtual Audio Cable.

Is this maybe the way to go?

As for sound quality ...well my hearing is that damaged from work and too many concussions that good is good enough.

Thanks
Richard