Problem:
In the current configuration, it seems that the playBack of new soundSets (be it soundSetShot/Explosion/for vehicles) is stopped while the maximum amount of "voices" is reached.
This leads to situations in which firing sounds, bullet cracks etc. become silent due to the amount of sounds currently played back.
Suggestion:
If raising the voice count further is no option, it'd be a step forward to implement a system that deletes the oldest sound source rather than preventing a new sound from playing.