no stereo sound on DDDAC with I2S

I have upgraded to Volumio 2 and purchased the RPi 3 with Kali reclocker for ultimate sound quality but I my flac files only want to play in mono.

I have tried selecting several DAC models in Volumio but nothing seems to work.

I previous Volumio there was a workaround by modifying /etc/modules with this:

snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
snd-soc-pcm1794a
snd_soc_rpi_dac

I did the same now but it does not work as before.

How can this be solved?