Before responding to an old post hoping for an answer from a specific member, click on their username to see when they were last on the forum. In this case the member you’re hoping for a response from hasn’t been here since April 2019.
So if your sub is working with movies and not music, there’s a 99.9999999% sure chance that you either have your main speakers set to Large or Full Range. If that isn’t the case, then you’re listening in Direct or Pure Direct mode.
The reason why the sub doesn’t work in those modes when listening to music is you’re sending a 2 channel signal with no discrete LFE signal for the receiver to process.
Welcome to the forum. You might want to take note of the stickied post in all caps directly above this one:
https://community.klipsch.com/index.php?/topic/196239-please-read-before-posting-here/
SVS' customer service is awesome. You can call them up, explain your setup and they'll guide you exactly how to get the sub properly set up and how to use the DSP and any other functions it has.