The file is not more than a * .xml, you just have to edit it and change the volume that by default is at 84 the value and set it to 90/92 so that it sounds much better, there are those who have reached 95 as far as I know but I would not upload it so much, better wait for the new Beta to see if...
Excuse me my English, it is not my mother tongue, could you tell me or explain how to install the xml I have Red Note 7 Lavender and the problem of low sound, I am not sure if it has to be done from twrp and the route, I can not find system / vendor , Thanks a lot
English is not my mother tongue so I apologize in advance, how did you do the installation? I got the update, I said download, reboot twrp, wipe caches, restart and everything fine since then