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The tab bar is fundamental to navigating in the app. It is at the bottom of the screen. If you are on the Now Playing screen you need to swipe it down to show the tab bar
If the bass slider works (changes bass output from speaker), but the treble slider has no effect, is the speaker blown? I'm having this issue on only one of my Play 1 speakers. Hoping speaker is not blown, and that it's a configuration or software issue. Any ideas to troubleshoot?