if you have a mediatek phone , sure you will know this feature called besloudness (it is in settings/sound) it is an audio post-processing feature that crank up you device volume, but when you install a custom rom(LineageOS...) you will not find this option cause it related to stockrom and sound can be sometimes disorted

this application is created to fix this problem by give you a choice to enable and disable this feature

I tested this App on UMIDIGI F1 Play (Mediatek Helio P60) Using LineageOS 17.1 Over Android 9.0 Vendor (Pie) and you can test it out on your Mediatek device too

this App is just for Mediatek Devices only

also the app will disable automatically besloudness feature if you reboot your phone