We happen to have two licensed pyros on staff (maybe three if the theatre even decides to pay for the rest of the training I need), so wehen we did the show we had Pyro effects. HOWEVER, we actually only used the pyro to produce realistic smoke and do the small "flash-in-a-pan" effect.
For the big effect of the mishap in the basement, we generated the smoke, and then had a sound effects track with explosions/commotion. We had rigged the basement door to be "blown" off it's hinges (it really just fell off). After the door fell off, the smoke drifted in and the actors came in all dirty. This effect could have totally been done with theatrical fog, we just made the choice to use pyro because we have the propper staff for it, and the effect looks a little more realistic.
Ironically, you may actually get a more "realistic" sound from a SFX track or SFX props (as mentions earlier) than from theatre pyro. Most theatre Pyro does not sound like outdoor fireworks.
For the big effect of the mishap in the basement, we generated the smoke, and then had a sound effects track with explosions/commotion. We had rigged the basement door to be "blown" off it's hinges (it really just fell off). After the door fell off, the smoke drifted in and the actors came in all dirty. This effect could have totally been done with theatrical fog, we just made the choice to use pyro because we have the propper staff for it, and the effect looks a little more realistic.
Ironically, you may actually get a more "realistic" sound from a SFX track or SFX props (as mentions earlier) than from theatre pyro. Most theatre Pyro does not sound like outdoor fireworks.