I have a VIP 622 connected to a Sony 60" tv with HDMI.  The Sony tv is connected to a Sony surround sound system with what appears to be rca jacks.  The tv sound is turned off, I always use the surround sound system.  Questions: 1.  Would optical cables provider better sound?  2.  Should the optical cable connect the sound system to the tv or the 622?  3.  Would I really notice the difference?