Thanks Invincible!!!
This hack probably saved my system! I had to send in my PS Audio Stellar DAC for repairs, and it came back with a new mainboard, which PS Audio says, “has issues” with Volumio. The issue - it won’t connect via USB with Volumio!
With your pin mapping and that Audio-GD module, I got it to work in glorious 11.2MHz DSD and up to 352.8kHz/24 on PCM. It only does 24 bit on PCM, but Volumio’s resampler takes care of the 16 bit files.
Thanks again!