What I think ive found is the V30 has 2 sound devices (not sure if its 2 DACS) but there is a low power device which seems to be what would be the default sound device for a LG phone (maybe the G6) and there is also the decent ES9218P DAC chip.
What LG has done as made a bad job of the mixer_paths_tavil.xml which includes references a ES9018 which was never put in the phone or any phone AFAIK.
But what I have just noticed is if you are using a set of low impedance headphones . It goes through to the low power sound device chip but keeps the HIFI DAC switch working so the EQ can still work. Unless you make it think you are running a different type of headset which it calls "Advanced" which is high impedance then it runs to the decent DAC and there are no problems.
I have also noticed in all the mixer_paths_tavil.xml from around the world markets that there are differences in settings which should be the same. Which is what could account for some people saying Low Impedance still runs through the same decent DAC and some people saying it doesnt. Either way mixer_paths_tavil.xml is a maze of old and incorrect information.
So with that in mind. I'd Like to share the results of my work with more always coming.
Audio Mod Options inside the zips
1 = "Can I play Daddy?"(No Mods)
2 = "Don't hurt me" (Good DAC SQ For Low Impedance Headphones/AUX)
3 = "Bring 'em on!" (Loud For All Headphones )
4 = "I am Death Incarnate!", (Very Loud For All Headphones )
5 = "I'm too young to die", (Dual Speaker Mod by @Dante63 only)
6 = "Hey, not too rough" (DS + Good DAC SQ For Low Impedance Headphones/AUX)
7 = "Hurt me plenty" (DS + Loud For All Headphones )
8 "Nightmare!" (DS + Very Loud For All Headphones)
Put in /system/etc for Nougat or /system/vendor/etc or Oreo (Requires root)
NO LONGER AVAILABLE DUE TO GETTING STOLEN WITH NO CREDIT