FIIO MUSIC APP

The FiiO music app not only allows you to play music from your smartphone/tablet but it also allows you to control their devices including the BTR3. So, from here you can disable the RGB LED, enable/disable charge, select input device (manually or automatically), set audio balance (left/right channel), select which bluetooth codecs you want to be supported by the BTR3 and finally you can also choose a lowpass filter (not a feature we actually used).

The app also has an EQ function which will be accessible later on and an operating guide page which can actually come in handy if you skipped reading the quick start guide.