A9 remote?

Here is my issue. I have an LG TV with an optical out for PCM audio. I ran it through a converter that will turn the audio into an RCA connection. I run that into the A9 speaker. I got great audio. But- now, my remote for the tv won’t control the volume. I’m trying to find a hand held remote that would raise or lower the volume on the a9. I can do it from opening the google home app- or the b&o app. That’s fine. Just looking to get something easier and quicker than having to open an app and adjust the volume. Ideas? Is there a remote that i can use for the a9 directly? Thx.