1. Pixel 2 XL with Sonata HD DAC Cable II: https://www.hidizs.net/products/dac-cable
2. Stock ROM with magisk. Pie latest patch.
3. There is no audio_policy.conf. I uploaded what looked similar.
Poweramp only outputs 24/48.
audio_policy_volumes.xml
audio_policy_configuration.xml
audio_platform_info_tavil_taimen.xml
audio_effects.xml