Effn Scotty

Figured out what was wrong just not sure why. I use MediaMonkey as my music library and player and I found a setting in it that was showing LGwebOS as the player. I've certainly never set that option so not sure if the TV webOS did it or if it was maybe my new (google home) smart device.

I have a win10 HTPC with all my media files on it. It's connected via HDMI to my home theatre amp which is connected to my LG tv via HDMI. If I'm watching a local stored movie or listening to my music collection on my HTPC it plays on the home theatre speakers and the TV just acts as a computer monitor. If I'm watching tv the audio is via the internal speakers or connected sound bar. Something has happened and now whenever I try to play music the LG tv automatically overides the amp and plays the music through the tv with its media server. How do I disable this function please?? I don't really want the tv to perform any media serving functions.