Critical hit sound effect and general effects

[pearllikesbirds]

For a long time now I've been looking around for a plugin that would allow me to add in a sound effect (and maybe a picture) every single time a critical hit is triggered. The only thing I could find was a dead link that was shut down due to the "creator" stealing code. Then I thought, why don't I just try to create a battle event that allows for this to happen using switches? I tried fooling around with that, but then I hit a roadblock and got confused. Unfortunately, I'm still a beginner when it comes to RPG maker. Is there anyway I can do this, or is this something that should be scripted instead?

(And if it should be scripted, would someone be willing to help or am I asking in the wrong place??)

Here's some screenshots that will probably help: