Originally Posted by
Silencer
Our internal sounds are handled differently than the custom sounds, in an admittedly not so efficient way (From a code management perspective). Getting them to play through the preview button currently would take more time both now and in the future to maintain then we want to spend on it. Realistically the code would need a refactor before that ever becomes a possibility.
For now the purpose of the Preview Sound Button is to make sure custom sounds will play correctly through our audio player.