Make binaural beats activation conditional

Binaural beats are useless on when played in speakers. This feature should automatically get disabled for internal speaker mode and selected Bluetooth devices (eg. bt speakers disabled, bt stereo headset enabled, etc)
Best implementation would be a black/whitelist for audio devices

Update after: BETA 20160203

Disabled on device’s speaker :heavy_check_mark:
Enabled on stereo bluetooth headset :heavy_check_mark:
Enabled on bluetooth mono headset or stereo speakers <- wrong
An option to enable binaural sounds only for specific bluetooth devices would be awesome.

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See also Binaural To Speaker