We have ur 5000t connected to a samsung TV. Using the source to the HDMI 1 port on the TV , then use the volume control on the TV remote to adjust the volume to your preference as the TV volume will govern everything on delivery .
We leave the sound control on the Humax on Maximum as.
Doing it this way, if you want to use the TV tuners instead of the Humax,
It’s done via the source button on the TV remote.
Then whilst watching Live TV through the Humax we use the Humax control for everything other than the volume.
But yes We do switch the TV and Humax on and off separately.