I would imagine, like the 975, the 976 would be able to decode DD True HD and DTS HD MA, 7.1 signals. Plus, deliver the core 7.1 from Dolby Atmos and DTS X formats.
TV's will handle PCM, some can decode DD, most can't decode DTS...Don't know about soundbars with HDMI, as even some stereo receivers with HDMI are unable to decode DD and DTS and therefore must be sent only PCM.
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Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV