Terncy, based in Shanghai, announced plans to release the Terncy Smart Dial back in October, which is essentially a smart button with a rotary dial. While it boasts the ability to control devices through its rotary dial, this feature is currently limited to programming inside Terncy's own HomeKit app, although it also serves as a standard push-button that can be configured via the Apple Home or any HomeKit app from any third party.
When we first reported on the Smart Dial, there was also talk of being able to control audio / amplifiers, although there was little detail at the time about how this would or could be done. Terncy has now explained how this particular feature will work, and it seems that they collaborated with Sonos to make the Dial compliant with Sonos devices. We claim in the company's own words; Terncy Smart Dial is now compatible with products from SONOS. The Terncy Smart Dial will turn the play state and adjust the volume in an extremely convenient way with a quick click and rotate motion.
Because Terncy is compatible with HomeKit and Sonos is compatible with Airplay 2, which in turn means that it is also exposed to HomeKit, automations involving both might be quite interesting and would eventually lead to a lot of clever results if users in the HomeKit group are anything to go through. Ideally we will soon be checking out the new Smart Dial, so keep an eye out for a review in the future.