Higher-octave cowbell sound not present in extra notes resource pack

[FluxCapacitor2]

Describe the bug
There is no minecraft:block.note_block.cow_bell_1 sound in the resource pack

To Reproduce
Steps to reproduce the behavior:

1. Apply the extra notes resource pack from https://github.com/HielkeMinecraft/OpenNoteBlockStudio/blob/master/datafiles/Data/extranotes.zip
2. Run this command ingame: /playsound minecraft:block.note_block.cow_bell_1 record @s ~ ~ ~
3. Notice that you don't hear a sound because it does not exist. If you were to use /playsound minecraft:block.note_block.cow_bell record @s ~ ~ ~ you would hear the normal cowbell.

Expected behavior
When you run /playsound minecraft:block.note_block.cow_bell_1 record @s ~ ~ ~ you should hear a higher-pitched cowbell, similar to all of the other notes in the resource pack

Screenshots

(notice how we see "cow_bell" and "cow_bell_-1" but no "cow_bell_1"

[MericGit]

iirc it's an issue with the sounds json. Some stuff isn't named properly

[Bentroen]

Oops, the sound event is completely missing from sounds.json. My bad.
Actually, not even the sound file is there.

[FluxCapacitor2]

I can add it real quick, I just pitched the normal one in audacity