Hi,
I have been using Volumio on RPI (all versions) to my DDDAC for a while and after each update I need to tweak the settings to get stereo output on I2S from 16bit files. This has to do with the dac being 24bit while RPI puts out 16bit words with 16bit material.
There is a fix for this that can easily be put into the distribution.
See underlined modifications to be made in mpd.conf:
"
Audio Output ########################################################$
audio_output {
type “alsa”
name “alsa”
device “softvolume”
dop “yes”
format “:24:”
mixer_device “SoftMaster”
mixer_control “SoftMaster”
mixer_type “hardware”
"
and:
"
samplerate_converter “soxr very high”
#replaygain “album”
#replaygain_preamp “0”
volume_normalization “no”
"
Please add DDDAC support in the dac selection pull down.