Nebulous, what are the chances that the sound problems are not chines but from Russian hacks? After all, the infamous SIO drivers that people are using for the trackpad come from Russian sources!
haha yes sure the bad bad russia . its always russia 😀
as i said be creative, use the techtablets driver source and try another drivers.
when you have always the problem from 10-100% loudspeaker volume, the chance is hight that the loudspeaker are crap