If we are already using positional audio in our scene, adding reverb in FMOD requires only a few extra lines of code.
FMOD::Reverb* reverb; system->createReverb(&reverb);
This creates a reverb zone that automatically applies reverb to every sound that a listener can hear when standing inside that zone. You can safely create more than one reverb zone simultaneously, as FMOD automatically combines their effects.
reverb->setActive(false); // Disable temporarily reverb->release(); // Destroy reverb