Hello MAXMP
Seems like the Hi Res support for Redmi Note 8 Pro is added successfully. I'm using it right now. But one thing, Injust wanted to report this issue: when Hi Res output is enabled, there are many cases, when the phone screen was turned off, the sound output produces some fluctuations (idk if that's the correct term) or for easier acknowledgement, there's some repeated audio frames (I estimate it from 70ms to 250 or 300). I tried all the possible tweaks but no luck.
Use Wakelock on/off: issue persists
Audio Buffer small/normal/medium/large and even custom values: issue still persists
Repeated the audio buffer setting for each available sample rate: issue still persist tho when using 48kHz, the fluctuating effect seems to be minimal but, still annoying
Keep Service on/off: yes, issue was still there
Change the resampler from SW to SoX: still there, not fixed.
Enabling/Disabling DVC (tho DVC is set to enabled always in Hi Res): still there, not fixed.
And I don't know if this is just in Poweramp, I'll get back to you later after some tests: the audio was so BASSY like there's some +2-3db addition in low shelf frequencies.
I hope you can fix the main issue that I was told here. Thanks!