Focus-A pads solves the 'hardness' around 4-5khz to some extent, making the bass heavier sounding because you're less distracted from that lower treble area. Subway Surfers Psiphon Hill Climb Racing

Delta-sigma has a variable resolution as opposed to the fixed resolution of pretty much everything else. The catch is delta-sigmas require really high oversampling rates to get meaningful resolution (I think it was 4x oversampling per bit or something).https://tgw.onl/hostgator/...