| CPC H03G 1/02 (2013.01) [H03G 3/02 (2013.01); H03G 3/3005 (2013.01); H03G 3/3089 (2013.01); H04N 21/43615 (2013.01); H04N 21/4852 (2013.01); H04L 12/282 (2013.01); H04N 21/42204 (2013.01); H04N 21/47 (2013.01); H04R 2227/005 (2013.01); H04R 2420/07 (2013.01)] | 20 Claims |

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1. A first playback device comprising:
one or more processors; and
at least one tangible, non-transitory computer-readable medium comprising program instructions executable by the one or more processors such that, while the first playback device is configured to play audio content in a playback group with at least a second playback device, the first playback device is configured to:
after receiving a volume adjustment message via a user interface associated with the first playback device when the first playback device is configured as a primary playback device for the playback group and the second playback device is configured as a secondary playback device for the playback group, (i) play audio content at a volume based on the volume adjustment message, and (ii) send volume-adjusted audio content to the second playback device, wherein the volume-adjusted audio content is based on the volume adjustment message; and
after receiving a volume adjustment message via the user interface associated with the first playback device when the first playback device is configured as the secondary playback device for the playback group and the second playback device is configured as the primary playback device for the playback group, (i) generate one or more packets comprising information corresponding to the volume adjustment message, (ii) transmit the one or more packets comprising the information corresponding to the volume adjustment message to the second playback device configured to operate as the primary playback device for the playback group, and (iii) play volume-adjusted audio content received from the second playback device configured to operate as the primary playback device for the playback group, wherein the volume-adjusted audio content is based on the volume adjustment message.
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