Create a text file containing the following text
Spoiler
Name the text file after the map name, followed by _level_soundsSpoiler
For example, if you wanted to do this for bitchass you would save the file as tfdb_bitch_ass_final_level_sounds. Move this text file to your downloaded maps directory (SteamApps\common\Team Fortress 2\tf\download\maps)
I have taken the liberty of throwing all the sound fixes that I've made for my maps into a zip folder.
https://db.tt/ZKRpfw9n