This would be an Allshare feature. To better assist you please provide the complete model code of your TV and soundbar.
I just purchased a Crystal Surround Air Track and connected it to my Samsung TV via optical cable.
I was under the impressions, assuming I kept my internal Samsung TV speakers on, that I could continue to use TV remote to adjust the volume on my TV the sound on the Crystal Surround Air Track would also adjust with it.
If this is the case, I would need to turn of internal speakers, but would still have have to use TWO samsung remotes when using Samsung Blu Ray (as the Crystal Surround only controls TV and bar).
Would appreciate some advice here.