No, I haven't, I use the tablet most of the time with headphones and I'm getting great audio quality with them, specially now that I'm using a usb-c adapter. Magisk is working on crDRom so I suppose that ViperFX should work.
I have also APTX bluetooth headphones but as i found out, the stock international rom has not support for APTX driver official and need some settings to be modded. This is one of the reasons why i want to have a root and magisk so i can install aptx mods available.I tried Titanium Backup with crDRom beta2, it did not recognize my sdcard and was not able to restore the most of my apps. You can find similar experiences in TB ratings in the play store.
Regarding the speakers, they lack really quality and a bit shame alldocube has put such low quality speaker units in such amazing piece of tablet. I sometimes dont reach my headphones or cant find them and when i put a film or a music on(youtube, vimeo etc), the speakers irritate me straight away. Thanks for the quick responses.