Just installed a TCL 615 Roku television. Everything is working well with Samsung HTSj4500 home theater system but I'm wondering if there's a way to have the roku remote control the volume for the home theater system without buying a universal remote.
If your Samsung supports CEC, then it should be possible. There's a setting in the Roku menu for controlling other devices that enables CEC. I can control the volume of my Yamaha AVR with the Ultra remote.
Dan Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.