Axxe...
If you have ever worked on large console's such as the SSL's then you know that all have a patchbay on the side of them. Every studio organizes their patchbay's differently according to what works with them the most. I can't exactly SHOW you how the Signal flow works but I can take a picture of a conventional signal flow of
a SSL 4000 G+ console works in a recording to tape (or Pro Tools) situation (since that is the board your pertaining to).
If you ever get a chance to record your audio into an SSL i don't see why the engineer there won't take care of that problem for you. But in any event THOSE patchbay's use TT (Tiny Telephone) cables. You would route the signal from the Multi-Track Return's into whatever the studio has set up certain channels for the Pro Tools HD I/O's (it's also common that they don't use the digidesign interface and Apogee Rosetta's. Its a little industry seceret..)
For Pro Tools all you need to understand is this. The faders that your seeing from your mix window are ALL RETURN FADERS. Think about that. Your interface (if your also using a pre-amp) is actually playing as your "to tape" faders as well as the AD/DA converters.
What part of the country do you live in? Maybe you could come over to PHX for a weekend sometime and I'll introduce you to the studio that I work at. Its called Chaton Studios (you can visit the website at
www.chatonstudios.com). It would be a lot easier to show you on a large console than try to explain it to you.
But in any event I hope that helps you understand a little bit more. As for the SSL signal flow chart, that is some really rare info to come by and I could sell that to you. Just give me a price. Please don't take this as me being a dick but I'm working on a book right now and i'm not even showing this in the book. Its not something you can get in a lot of situations (even for money). Its something that is earned when the engineer's before you decides that you deserve it and believe me, I had to do 3 years of hard grunt ass work for this.
So I honestly don't mean to be rude but since this is just a casual forum, I couldn't post something like that up. Most people actually don't realize the importance of signal flow but I know you obviously do (or else you wouldn't have asked me to begin with). If you give me a good price, I will also give you a very standard arrangement of the patchbay, as well, on SSL consoles and most patches would work into the signal flow. =)
But thank you very much for bringing up this topic! I hope you all understand the importance of signal flow. It can (in some situations...like mine) make or break your chances at being an engineer for the studio (and not just their *****).
Best Question so far~!