O.K. guys.. I have an 88 key Yamaha Portable Grand DGX-500. I also have a Rolls MX 28 Mini-Mixer. And lastly, I have nice gaming headphones with a USB plug. HOw can I hook all this crap together so that I can play the keyboard along with audio from the G5 and hear them both through the USB headphones? I have the necessary cables, plugs, jacks, etc to run the keyboard through the Mini-Mixer. I also have the adapter to run the dual jacks from the Mini -Mixer into a small jack that will plug into the audio imput on the G5. Again, How can I make this all work so that I can hear it all together either through the USB headphones or through the G5 external stereo speaker system? :Confused