You can try this. It is toggleable and plays every .wav file your move in the folder "YOUR AUDIO FILES" randomly (e.g. the wanted level sound). You can also change the toggle key (standard = H) and add a modifer key. Requires scripthookv and community scripthook. Unpack and move the scripts folder in your gta v main directory. Just a test, if you like it, i will improve it
PlayYourAudio.zip
updated file moved to here: https://www.lcpdfr.com/files/file/22105-play-your-audio-soundtracks-in-the-background/