Sound Notify
We can allow players to mention others in the chat: "Hello @kangarko!" and play a sound to the player who is mentioned.
You can specify the cooldown between each mention, the sound and the color. You can also restrict this feature only if the player is afk, or prefixed with a certain string like "@".

Setting Up Sound Notify
Sound notify requires channels. To configure it, open Sound_Notify sections of settings.yml:
For a resource pack sound, set Sound_Notify.Sound to custom:custompack:message 1F 1F, replacing custompack:message with the sound's identifier. The same syntax works for Private_Messages.Sound. Players need the resource pack to hear it. Set the sound to none to disable it.
