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On the stock media player, the 5.1 sound function can be used only if sound effects are off. But I'm not seeing any way to clear all the buttons in the Equalizer and Effect menus. Is there a setting I'm missing?
Actually it only works with your headset/earbuds or external speakers. Whatever is plugged into the phone.
To turn off effects, set it to Normal (Should be the second on the list, after Auto)
Screen Time Out:
My Device (T-Mobile app in the launcher), Quick Tools (at the top), Screen Timeout.
(If you just go to settings, Never is not an option)

Set both Equaliser & Effect to Normal and you'll then be able to toggle the 5.1 on & off.
