OnActive?
This.
With the proper events, this could easily be done with relays/activator bricks. If you know how to use events, then you should be able to do it without an addon for it.
An example:
OnActivate --> Self --> Play Sound --> ####
(Using slayer): OnMinigameRoundStart --> Minigame --> Playsound (My memories a bit shoddy on this one, no 100% guarantee.)
Either way, what I'm trying to say is, just get slayer and richard around with events. You should be able to come up with a working event. If you get desperate or absolutetly cannot do it yourself, open up a server and I/anyone with event know-how can try and assist you.