Fiio K3 - Scene 1: Connect to Headset

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Scene 1: Connect to the headset using a 2.5mm or 3.5mm port
note：
 When both headphone jack and a BAL jack are plugged in, only the
BAL jack will be valid;
 If you want to use the 3.5mm headphone jack, please unplug the
2.5mm balanced jack device;