Add possibility on iOS to control music without unlocking the device and opening the Spotify app when using Spotify Connect as audio output. This is currently possible only when the iOS device itself is outputting audio. This should be possible easily with iOS as Sonos is doing something similar with their app. Android already has this w/ Spotify. Hugely important feature as it's a pain to always having to unlock device & open the app to change volume or skip track.
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