Unable to hear processed track while live working

So after spending nearly £400 on decent software I feel like I am getting nowhere at the moment. :frowning:

I am pc based running xp with the RME Digi96/8 Pad sound card running Wavelab 7.

So far I am able to send a signal out of the pc, through DAC, analog gear, back in to ADC then back in to the pc all fine. When I play around with the output on the mastering compressor I can see the level change on the screen but I hear no different through the monitoring. :frowning:

I have tried to do a little research using the search button but didn’t find anything that helped, hence why I am posting up here.

Any help would be greatly appreciated.

Cheers. :slight_smile: