If I recall, volume can be controlled through either the PVR or the TV with the remote. Our SONY works fully with the Slimline2 remote, including volume, but our Fluid TV does not. Volume and on/off on the TV is controlled by the TV remote, but volume can also be adjusted through the wireless receiver.
Cafekief, you've been advised many many times, if you are having problems programming your remotes, call Telus. It also has absolutely zero to do with your Optik set top box but everything to do with the remote not being programmed correctly.