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You should be able to if you have one of the New style smart remotes from Comcast you should be able to go into the menu of your table box and get the remote code for the Klipsch unit otherwise look online
Yes, you can program the remote to operate the volume of the soundbar.
Yes you can. The user manual will make any type of remote, other than the few listed, seem impossible to link. But, with few simple steps you can find on YouTube, you can link about any recently made remote without issue. My Vizio remote is very happily controlling my rsb-6 sounbar. Good luck.