Sorry, but something about the way you've constructed your post is excruciatingly difficult to read. I'll try the best I can interpreting from what I see above ;).
Try the following 'recipe', and let me know if I missed any of your components from the 'soup' you've provided (which model radio dock???? what kind of plug does it have??) 8-)
Unfortunately, I don't see any way to have everything run through the HT since it doesn't have enough inputs. Either the Roku or the Wii is connected to the HT component. For $100+ more you could have picked up an Onkyo HTIB which would have solved this issue.
Which of the Roku boxes do you have, btw?? I'd guessing perhaps it's the HD model since you mention both HDMI & S-video ouput.
HD DVR (HDMI out) -> (HDMI in) LED HDTV
" " (digital optical out) -> (digital optical in) Samsung HT
Wii (composite video out) -> (composite video in) LED HDTV
" " (composite audio out) -> (composite audio in) LED HDTV
*doesn't output surround sound, so I opted to connect directly to your HDTV
Roku (Component video out) -> (Component video in) LED HDTV
"" "" (composite audio out) -> (composite audio in <via aux in>) Samsung HT
Apologies for the repost - I posted this in the Samsung forum but no one has replied.
I just yesterday upgraded my home system. I had an HD CRT TV that worked fine, but wanted bigger, flatter, etc. and I thought I needed more inputs since I used to have to unplug the Roku to use the Wii and vice versa. I ended up complicated things WAY more. I think I screwed everything up.
previous system -
Samsung 30" widescreen TXN3075 (crt tv - no hdmi)
Samsung Home Theater HT-P38 (no hdmi)
Scientific Atlanta 3800HD DVR
Roku box for Netflix
dock for XM satellite radio receiver
Cable and Home theater used component cables to hook up to the TV.
All sound came through the Home Theater - whether it was Wii, Roku, DVD,
TV, etc. The Wii and Roku only used composite and S-Video, yet the HT powered the audio.
So I got a new large LED backlit TV and a new home theater for DVD and surround sound.
Now, none of the HD channels are HD - everything is letterboxed and stretched. Time Warner is coming on Wed. but I have no idea what's wrong there - everything is set for 16:9.
I didn't really want a new home theater - but thought I need the 1 component on the TV for Wii - and my old one didn't have HDMI.
New set up -
Samsung UN40B7000 LED-LCD TV (4 HDMI, 1 component)
Samsung Home Theater HT-Z420
Cable box, HT, and Roku are hooked up to the TV with HDMI.
Only DVD gets sound through HT unless also use optical audio to cable box.
Then Roku has no sound through HT, and the Wii won't either, and I don't know if the radio dock will work yet either.
I would like all peripherals to have sound through HT. How do I hook this up?