I see in one post that raspiaudio Hat (hifiberry drivers) work flawless.
I have this hat and I can’t ear any sound.
I select hifiberry DAC (A/B) ofr the sound card but nothing appear after restart the pi.
I use it on a pi 2.
Please try adding hw:1 to your command line options. If this does not help, please remove it and deactivate build-in audio in the Raspberry Settings and select the HiFiBerry DAC+ driver instead.