Krell KRC3 preamp


Does anyone know if KRC3 preamp can be integrated into a home theater  processor ? 
Is this possible and has anyone done this? 
If indeed possible, how would I actually do it? Exactly which cables go where. 

My system includes: Mcintosh mx135, oppo 205 player, and Krell KAV500 amp, vienna acoustics haydns. 
I am aware that I can use mx135 as a 2 channel and HT, but would prefer to add KRC3 to my system for 2 channel audio. 
ei001h
My suggestion:

the "stereo audio out" on the oppo 205 connect to KRC3

the "5.1CH audio out on the oppo 205 connect to MX135

use a Goldpoint SW4 Main out connect to KAV500 FR and FL input
http://www.goldpt.com/sw4.html

KRC3 output to Goldpoint SW4 Line 1

MX135 FR and FL output to Goldpoint SW4 Line 2, center and RR/RL channel to KAV500

for stereo playback, power off MX135, switch Goldpoint to Line 1 to use the KRC3 as preamp

Goldpoint switch to Line 2 for MX135
Thank you. Is this the only way to do this? 
Is it possible to do it without Goldpoint SW4? 
I read this in a review but don't understand it: 

"Input S-3’s hidden potential is to act as a unity gain stage, perfect for explaining its complete label of ‘S-3/Proc’. ‘Proc’, of course, is short for ‘processor’, meaning surround-sound. If configured for the latter through the internal switch (the standard setting is as a conventional line input), the KRC-3’s volume control and balance are disabled when the S-3/Proc input is chosen. In this mode, the overall system level is accessed through the surround sound processor. Naturally, this leaves two-channel operation through the other inputs absolutely untainted by force-feeding through the surround-sound unit – a true by-pass for purist stereo listening" 

Seems there is a way to do it, but not sure how to connect it in this way. There is more about this in the manual online, but still difficult to understand. Can someone please explain
@ei001h
You need to remove the top cover of the Krc3, look for a red dip switches labeled "Input configure" and set the S3 to Proc. position.
If your KRC3 had configured the S3 as Proc, then you can use this input as a HT passthrough and connect it to MX135 FR/FL output,

the connection as below:

the "stereo audio out" on the oppo 205 connect to S1 on KRC3

the "5.1CH audio out on the oppo 205 connect to MX135

KRC3 output to FR/FL of KAV500

MX135 FR and FL output to S3 on KRC3, center and RR/RL channel  output to KAV500

for stereo playback, select S1 input on KRC3, S3 for 5.1 playback.