How do I play sound on animation frames without echo?

I want to play a punch sound on specific animation frames. If I use the following, I get an echo effect because C3 plays the sound once every 1/60th of a second that the animation frame is playing:

I can do the following, which will prevent the sound from playing again until it has completed playing:

However, this wont work as I do want some overlap, and I don't want to wait for the full punch audio to end before I can play another. The best solution I came up with was:

I'm not a fan of this option, since I'll have a lot of sounds playing and will need a lot of these soundPlaying variables to keep track of. It's just not very clean.

Is there an easier solution?

Use the system trigger once while true condition.

Sorry it took so long to respond (had just left for vaca) but this worked like a charm - thanks!