Hi, I tested all music of your packs and here are the list of the ones who cause me Crackling/Popping noise peak, it's like 1ms saturate spike noise every seconds.

Do you see any similitude with that list? Did you change your method of encoding? Same update? Same sources?

I did a lot of testing on my computer but can't figure it out.
Strangly when I open your mod.zip the sound are perfect, it's just appear ingame for the following ones.

All others sounds are perfect except the last 4 write down.

[Cracking Noise]
0 Mass Effect Andromeda - Trail of Hope
Attack on Titan - Body Motion
Dark Knight Rises - Main Theme
Ender's Game - Command School
Ender's Game - Commander
Ender's Game - Final Test
Ender's Game - Salamander Battle
Mass Effect 1 - Spectre
Mass Effect 2 - Crash Landing
Mass Effect 2 - Suicide Mission
Mass Effect 3 - An End Once and for All Extended Cut
Mass Effect 3 - Fleets Arrive
Mass Effect 3 - Leaving Earth
Mass Effect 3 - Stand Strong
Sector 9 - Exosuit
Star Wars E3 - Boys Into Battle
Star Wars E3 - Jedi Temple March
Star Wars E3 - Jedi Temple March
Transformers 1 - Arrival
WoW Cataclysm - Twilight's Hammer
Zack Hemsey - Mind Heist
Zack Hemsey - The Way

[Saturated Peak]
Clash of the Titans - Written in the Stars
Dark Knight Rises - Deshi Basara
X-Rebirth - Seconds to Eclipse

[Too Quiet]
Knight of the Old Republic - Main Theme