Well, I am working on a custom texture pack for my very big map. And I found that after I replaced all the sound(like sound of taking damage, open door etc.) to custom sound for the map, it is still not enough. I need to have 3 more audio to add into the texture pack.
So my question is... Can I put a custom sound that doesn't exists in Minecraft into the texture pack and play the sound in game with the texture pack by /playsound. ? Or there is some way else to add more custom sound?