While I have the 95, the hook ups for multichannel are the same (or so I am led to believe).
Hook the analog FR/FL to the main L/R analog outs. Hook the sub, C, and surrounds to the multi channel outs on the 105. On the 8801 (the pre pro I have) make sure you run it in direct or pure direct when listening to multichannel audio, otherwise the analog will get converted to digital, processed, and then reconverted to analog. That's not good.
Hopefully I didn't misunderstand what you were looking for and this helps.
Hook the analog FR/FL to the main L/R analog outs. Hook the sub, C, and surrounds to the multi channel outs on the 105. On the 8801 (the pre pro I have) make sure you run it in direct or pure direct when listening to multichannel audio, otherwise the analog will get converted to digital, processed, and then reconverted to analog. That's not good.
Hopefully I didn't misunderstand what you were looking for and this helps.