How to make sound muffled?

[Ruriko]

I have a missile sound effect that's flying all over the place and I was wondering how can I make it sound muffled when it flies around a large rock cliff?

[kozikowski]

This sounds like one of our television commercial clients. "You have to pull off a complex special effect and you have two seconds, Have a good time."

Any way to get maybe five or six seconds of base sound?

Koz

[steve]

Make a copy of the track (select the track, then Ctrl+D)
Apply the "low-pass filter" (Effect menu)

Try the default settings in the low-pass filter first. To make it more muffled, increase the "Rolloff" setting or lower the "Cutoff frequency" (leave the filter quality at 0.7071).

Then use the fade-in and fade-out effects to cross fade from the original track to the filtered copy.