Hi! IMHO I have low sound level, but I can use it without any problems, including with a bluetooth headset.
Step flashing MIUI last chinesse version is needing. I first have flash global MIUI, and I have low battery without deep sleep! Here I flashing chinesse , and next TWRP, and next Pixel Expiriens - good working it!
No turbo charge, only rapid charge.
Whether it’s good or not, you only know if you use it.If you feel my work is rubbish, just use stock ROM instead.
After some tries, I have fixed it this way: