There isn't an issue to add at first place aosp or los does not come with Dolby Atmos and it's been known from older even in current or new devices the sound is not the same as stock, but that does not mean it's not loud enough... You can always modify it by yourself with some digging and searching!That's with the volume on max.
Not even trying to complain about the ROM, just wanted to warn other people by putting it into perspective and ask for a workaround.
And if it's such a common issue, why is it not mentioned at all in the "known issues" section? My first thought was that it's because it's an issue with Samsung devices, but if that was the case voLTE wouldn't be there.
And not sure why it matters, but my device is beyond2lte.