Doesn't play on dual speakers

[cyrill62]

Actual behaviour

Some new devices have a dual speaker like HTC, OnePlus, Samsung Galaxy s9.

But this player always plays songs on the main speaker.

Expected behaviour

Play with all speakers.

Steps to reproduce

1. Have a dual speakers phone
2. Get a stereo song file.
3. Play the song with this app.

Environment data

Android version: 9.0 Device model: starlte Stock or customized system: customized Music-Player app version: 1.2.0

[cyrill62]

For example the https://github.com/ram-on/SkyTube/ app play well on dual speaker.