Some nether ambient sounds are still missing in the Basalt Deltas biome.

I was looking at the files that I downloaded in my phone when I updated the music pack and I realized that in the Basalt Deltas biome some ambient sounds are missing, these are the missing sounds:

Basalt deltas active 1
Basalt deltas active 2
Basalt deltas active 3
Basalt deltas active 4
Basalt Deltas Basalt Ground 4

 

Reference:

https://minecraft.gamepedia.com/Ambience#Basalt_Deltas_ambience