Can the Slide Pro remote control input on an A/V receiver?

So I picked up a Slide Pro remote for my new Roamio and seem to have everything set up with it EXCEPT the ability to switch inputs on my A/V receiver. I have the TV Pwr button set to turn both the TV and Pioneer receiver on and off. The Mute and Vol buttons control the receiver. But I can't get the Input button to work with the receiver. I was able to use the learning function to get the Input button to switch to the correct TV input but can't get that button to control the receiver. The Slide Pro actually flashed four times in learning mode after receiving the receiver input command, as though it had successfully learned it, but when I tested it out, the light on the front of the Roamio flashed but the receiver did nothing.

Beyond that, I don't even know if it's possible to have that button control BOTH the TV and the A/V receiver at the same time, the way the Pwr button can work both. When I use the TiVo, I need to switch HDMI inputs on the TV AND switch to the optical audio input on the receiver.

This is weird. Assuming someone is using a receiver, they most likely would need the ability to switch inputs on it. Why would TiVo make the remote so that it could control volume on the receiver but not inputs?