watch out for this one though, did a remix the other weekend for a label who wanted something in the style of a previous record which had this massive rolling reverb as a bass line (compressor and reverb off the kick drum kind of thing).

Anyway so I set up the basics of the mix and finally noticed that the reverb was generating a massive amount of energy below 20Hz which meant whenever the bass kicked in the entire track was ducked by the compressor on the master bus.

Anyway moral of this is if you are using reverb as an effect like this try a high pass filter after the verb even if it sounds alright and see if the overall level of the track sorts itself out...