In my personal experience, I've found that the default sounds for the votekick system to be too loud, and having no sound for the votekick to be a bit confusing (not aware a vote is even happening, thus aiding the bot in staying on the server).
So I decided to create my own sound mod to try and strike what I believe is a balance in the voting sounds.
The audio files and a vpk are provided in the github link. You'll only need to put one or the other in your tf/custom folder.

maffaaa's Vote Sound Lowered Mod (Github)

Over the past couple of days, I've been going through each of the sound files for TF2 and renaming blank files (audio files with no sound) with the names from the TF2 directory. As a basic example, instead of "haha scout swing bat go woosh" its "haha scout swing bat go no sound".

I initially sought to create this mod in order to keep VoIP (the unique and wonderful audience of TF2 talking in-game) while getting rid of the game sound, as turning down the game volume turns down everything. While I do believe there is a much simpler way of removing sounds from the game without having to go through each audio file, including audio files from hl2 source, I was unable to find any resources that would assist me (at least none that seemed straightforward to me).

So while this mod was intended mainly just to record game demos with only the VoIP audio, it can also be removed ambient noise and anything that any users may find annoying or unnecessary to the game. However, as mentioned, the files do include some hl2 audio files among the tf2 audio files (half of which were probably not needed), so be cautious when transferring these files individually as you may lose sound in other areas that you may not have intended.

That being said, if you come across any issues that cannot be fixed with a simple "snd_restart" into console, please let me know. An example of the mod being broken may include, but not limited to, sounds occurring in standard maps/games, or weird glitchy noises. Feedback is definitely appreciated, however, keep in mind that this mod may not always be kept up to date as a better alternative comes to light or the demand for the mod is insignificant. Thank you for using my No Sound Mod :)

Downloads for the mp3 and wav files are provided below along with the vpks

Mod Directory: C:\Program Files*\Steam\steamapps\common\Team Fortress 2\tf\custom

This mod is updated as of May 4, 2020 A Hell of a Campaign (R.I.P. Rick May Update)

mp3 and wav

wav