Audio Output level

Been using Channels with my Apple TV for a few months and am loving it. My setup is Apple TV, Yamaha Receiver, and Vizio TV. I managed to get CEC working properly where I can use just my Apple TV remote to control everything including turning complete system on and off.

The only issue I'm having is with the Audio levels. If I'm using the Apple TV+ app or Netflix, etc. the volume is much louder than if I'm using the Channels App. Additionally the volume up/down is very slow moving (I'm thinking this is a CEC problem.) Is there a way to increase the volume output from the Channels App itself to a point where it matches the other Apple TV apps?

Thanks in advance,