Cal audio ssp 2500 for SACD multi-channel


I have a cal audio ssp 2500 that I love for HT and 2 channel. I now have a modified Denon 3910 and would love to be able to use the 2500 to pass through the multi-channel analog for SACD from the 3910. The 2500 does not have a multi-channel pass through.

Any suggestions?

Thanks.
jmpwme
Thanks - I've already talked to scott. He'd be willing to assist with schematics, but is unable to do the work.
I would be interested in doing the same thing with my cal ssp2500. Were you able to get an answer if msb would install a 5.1 input to the cal?
thanks,
Michael
MSB did not respond, but I did not call. Given that I'm also about to purchase some blue circle equipment, I have asked Gilbert at Blue Circle to take a look and see what he can do. He should be back with me within a week. If that doesn't work, I'll call msb, unless you call them first. If you do, let me know what they say. Their website is pretty clear that calling is more likely to result in an answer.