I have run mine for the last two years without any mute features installed. But to be honest, after 30+ years of riding without music or communication, I am just pleased as punch to have it and have not added anything. I can see a separate volume control in the future as she does hear better than I and I like my music a little louder than she does.

Rock on!
Also, this might make a difference. We both ride with full face tilt up helmets.... so our mics are Velcro-ed to the front of the chin guard. Probably not as much wind noise as there is on an open faced helmet with a microphone boom hanging out there in front.
Note: The communication between the two riders has a separate volume control than the radio/music. You can turn her off, still jabber on the cb and she doesn't have to participate or she can just pull the plug!