[Cuttlas]

no, it will not work, it will stop the sound for less than a second and while playing the mp3 all sounds will played.

the stop sound command and playing mp3 will not run at the same time, first, stopsound will execute and then mp3play

[Cuttlas]

both stopsound and mp3play will execute on the same thread.
I think we should run both commands at the same time on two different threads.