You need Custom OST by Nate in order for this mod to work properly
https://modworkshop.net/mod/27359

audio used: https://www.youtube.com/watch?v=0JcM8jLAfdo

adds the bottom gear experience as your heist track

Files:

The Bottom Gear Experience Pack contains the audio for steath and assault.
The Bottom Gear Experience Pack 2 contains the audio for stealth, assault, control and buildup