Removing the default roblox walking sound

So I have this script, its basically RbxCharacterSounds but modified to play a custom sound depending on the material of the surface you’re walking on, and I’ve noticed that both the custom sound and the default walking sound play at the same time.
How do I remove it?

EDIT: Disregard, found a solution.

Remove Running from the HumanoidRootPart, here’s a script to do it:
https://www.roblox.com/library/8909016780/Remove-Character-Sounds

Does not work, it removes my custom footstep sounds and doesn’t remove the default sound.

The script that I gave you? ch

The script I’m using does work, however when I look in the player’s head and check the running soundid, its always set to the plastic running sound, even though it should override it.

EDIT: I think this is just from another script I have that’s interfering.