midix got a reaction from Igor in Cannot get stereo sound on NanoPi NEO2 v1.1 line-out pins
Thank you, after configuring it works fine and in stereo! So, I guess the audio codec drivers supplied by FriendlyElec were messed up.
The sound quality is OK - good enough for listening on headphones or any non-hifi system. Will see how it works with ZynAddSubFx soon.