Has anyone upgraded their Pioneer Elite VSX-49TX receiver to include the firewire input. According to Pioneer's website you can bring the receiver to their office in Long Beach, CA & for $500 upgrade the receiver to make it just like the new VSX-49TXI (firewire input & other things). You have to bring cash & the offer is good until July 31st of this year. If so does the firewire input on the receiver & the 47AI make a huge difference in sound for DVD-audio & SACD. I'm considering getting mine done & buying the 47AI for the firewire input if there is a huge difference in sound for DVD-audio & SACD. Does the firewire allow you to use tone controls for bass & treble on DVD-audio & SACD? What other differences would the firewire input make over the original analog in inputs. How big is the difference in sound if I upgrade to the firewire inputs. Thanks for your help.