How do I wire this crap?

[String Slinger]

Ive been playing for years but am just now getting into the recording end of things. I recently found a used Digitech GSP21 Pro that was practically free. My problem is this, Ive never used rack effects and dont now how to do it as I have had to reduce output levels on all the equipment to get a mangeable signal at the recorder. I do not understand stereo links and such. My rig is as follows.
GSP 21 Pro
Digitech RDS 3.6 Digital delay
DOD R 825 Comp/limiter
from there i run to a Behringer MX 602A mixer then to a Yamaha MD4s recorder. My bass rig is simple Digitech BP200-DOD R 825-MX602A-MD4s.
Also in the system is a Boss DR3 to MX602A to MD4s. I also have a DOD 12 channel EQ in the rack but dont plan on using it. Any help on how to rig this stuff up would be greatly apreciated.

[Bob's Mods]

This stuff can be both easy and complicated. I suggest a newbie book is a good place start. Sorry, I know thats not what you wanted for an answer.

Bob