Sorry. Didn't realize that you were using v4a.It looked liked it took but messes with viper which doesn't work now.
When I used a third party Dolby a while ago that everyone said sounded better than stock dolby, it breaks the stock dolby, and now since I'm on android 11, I would love to have this stock one back. Viper alone sounds bad so far compared to how I had it set up on 10.
Try wavelet from v4a master Dewitt
Or try this one that is dax3Dolby atmos apk with equalizer
No need for root
Just install and open
modify equalizer and volume
To boost speakers
You will be amazed by sound boosting
Ported from razer phone
Working with 8 pro and 7 pro