The legal issue seems to stem from a few Sonos patents:<p><a href="https://www.theverge.com/platform/amp/2021/8/13/22623977/sonos-google-patent-lawsuit-itc-judge-initial-ruling-infringement" rel="nofollow">https://www.theverge.com/platform/amp/2021/8/13/22623977/son...</a><p>For example, Sonos has patented "Method and apparatus for adjusting volume levels in a multi-zone system" and the patent shows an app where you can set volume levels for connected devices:<p><a href="https://patents.google.com/patent/US8588949B2/en" rel="nofollow">https://patents.google.com/patent/US8588949B2/en</a>