Minecraft with REALISTIC SOUNDS! (Dynamic Surroundings Mod Showcase) - YouTube
MOD MONDAY: Echoes and Reverb in Minecraft (Sound Filter Mod) - YouTube
Sound Filters - A Client-Side Mod (adds reverb to caves, and a few other things) - Minecraft Mods - Mapping and Modding: Java Edition - Minecraft Forum - Minecraft Forum
Amazing "Sound Shaders" in Minecraft 1.11! - YouTube