I leave my MU-2 on all the time.
I control volume with the svelte Apple Remote which is super easy to program to the MU2. I tried using Roon to control volume, but I wasn't really comfortable with that.
The Roon screen on my iPad shows the MU2's voIume setting as an Endpoint in the lower right corner.
I switch inputs using my phone or iPad connected over the network to the MU2 via its easily determined URL.
Easy peasy.
Break-in takes forever, and it does sound terribly closed-in out of the box...