Raspotify & USB DJ Mixer

[JosephBoseph]

hi everyone and thank you in advance for your help / insight. I am trying to use Raspotify with my Pioneer DDJ-SR2 mixer as the audio sound card with little success.

my device shows up with aplay -L
my device does not show up with librespot -d ?

i have tried many things including changing the default audio output, in my case hw:3,0 in the raspotify/conf file and matching the sample rates to the mixers default (44100 / 24bit)
i have tried disabling the pi's internal soundcard
i have added code in asound.conf file to force use of the usb audio soundcard
alsamixer show up correctly with the USB sound card DDJ-SR2

when i speaker-test -D hw:1,0 -c 2 i get errors: sample format not available for playback: invalid argument
Setting of hwparams failed: invalid argument
i was able to at one point to get sound to play out of my speakers with the command speaker-test -t wav, but at that point when trying to use spotify connect, i couldn't get the audio to play in my app on my phone. play button wouldn't do anything, time bar not moving etc.

I will add that I was able to successfully use my mixer with Volumio.

I have a feeling this mixer is just incompatible with Raspotify but wondering if there's any way to make this work? I am very new to command prompts and coding but eager to learn and figure this out!