Mixit,
you have to activate all your buses...how many outs is luna?? you should be able to activate one bus for each two outs on your card...at the moment, you probably have only your master bus active
Click on panels, then VST Master Mixer. You should now have a panel with the master bus and all the other stereo buses (depends on how many outs you have on the card), but they will not be activated..just click on the green "active" buttons and that should be it.