As many users have been asking for. :)
Place your sounds in a folder called CustomSounds, which should be located in the games data folder in your installation directory. Eg:
E:\SteamGames\steamapps\common\ASMR Universe\ASMR Universe_Data\CustomSounds
Also, sounds have to be .ogg format or they will not work!
Enjoy!
:ASMRCat::ASMRDog::ASMRRat::ASMRWolf: