TheMaartian
Here's a dup of something I posted in another thread:
 
from a March 2005 Sound On Sound article:

To create that effect authentically, send the drums to a reverb with a medium room preset selected. Now route the output of that reverb through a stereo noise gate (or patch a stereo noise gate into the reverb's return channels) and set an instant attack and pretty much instant release. The gate's hold time can be adjusted to taste, but the threshold should be adjusted carefully to avoid any 'fluttering' during the final part of the reverb tail. For more accurate triggering of the noise gate, take a feed from the drums into the gate's side-chain so that the percussive attack from the drums is used to trigger it, rather than the onset of the reverb alone.