Connecting AppleTV with Hifi - can I control volume ?

Hi,

I have recently upgraded by Speakers and they are great. However, I have an issue with the signal from the ATV.

the ATV is connected to a Wireless Transmitter for the Speakers via TOSLINK

The Wireless Transmitter is connected to TV via the Headphones out (via cinch).

The ATV is connected to the TV via HDMI.

I can stream to the ATV via airplay from my iphone but the signal is very loud (for the iPad even louder) and I don' see any means for adjusting the "volume level" (on the iphone & iPad its at minimum) as I can do with the headphone volume adjustment on my TV (TV sound is good to the Speakers).

Questions:

1) If I get an AVR and connect the ATV with it via TOSLINK and

2) Connect the TV via HDMI with the AVR and then

3) Connect the AVR via Line-out (cinch) to the wireless transmitter for the speakers.

Would this configuration work ?

Would I be able to control the volume level via the AVR ?
What things should be considered ?
Are there any other options ?