A simple interconnect could be the answer to all your problems.
I'm hoping the receiver has a pair of plugs on the back marked "tape out". If so, these would be what you want to use to connect to the Yammie's inputs. Actually, whatever source you select on the Yammie will be fed to the Yammie's inputs so you esssentially have a fancy switchbox with a built in tuner.
You'll have to use the volume control on the Yammie for these inputs, including the tuner. No other controls on the receiver will have any effect on the signal.
Well, you might as well maximize what that receiver can do.
You can feed ALL of it's inputs to your speaker system. Plug in a CD player, phono, Ipod device and perhaps a tape deck. Ya got 'em. Ya might as well use 'em