Overview
how to replace any song in underale with any other song. (As always, I found this out completely by myself)
How to do it
1.) C:Program Files (x86)SteamsteamappscommonUndertale
2.) Find the song you want to replace by looking for the name or playing files until you find the right one.
3.) Get the song you want that isn’t from undertale. this can be any song in any format that you want and it will work.
4.) Use audacity or VLC to convert it into .ogg
5.) Paste the converted file into C:Program Files (x86)SteamsteamappscommonUndertale with the name of the file you want to replace (I.E. If you wanted to replace megolavania you would name it mus_zz_megolavania, or for undyne’s theme mus_undynetheme)
6.) Load undertale.
7.) ENJOY!
Reversal
To put the songs back to the original, Either:
1.) Before you do it, copy the songs and paste them into a new folder before you replace them with the new song
or option number
2.) Delete the new song you pasted and then right click undertale in your steam libarby, then go to properties, go to local files and then click verify integrity of game cache.