If you are using the receiver as strictly a power amplifier, the volume control on the receiver can act as the "level control" for that amp. Then, you would not need to construct the outboard level controls since you can use the receiver's volume control to control the volume of that amplifier. The only thing you would need to do is to buy a "Y" adapter, and route it to both the input of the 200, and a line input of the receiver, ignoring the "pre-outs" of the receiver.

I'm assuming you are using another preamp like the 950 or something similar for the main switching and overall volume duties?