How do I handle sound effects when many are overlapping at once?

Hi, I was wondering what the best practice would be for handling many sound effects overlapping each other. Without it becoming a horrible mess or becoming too loud.

In for example a tower defence or shooter style game where many towers or enemies are shooting at the same time.

Thanks.

Use tags and check that this tag is not already playing:

Audio Tag "explosion" is NOT playing 
-> Audio play Explosion.wav with tag "explosion"

As well as what dop said, a general good rule is to keep volumes slightly lower than you would expect when doing sound design. Users can always turn up the volume using their hardware, but they can not turn down the peak distortion if the audio is overloaded.

Thanks guys will give these a try.