There is nothing to figure out. Yes, they use an EDACS ProVoice system and yes there is no scanner that can decode ProVoice and probably never will. The digital mode ProVoice is proprietary and it is unlikely that it will ever be licensed to scanner manufacturers. Monitoring ProVoice systems is still possible using various methods.From what I understand St. Tammany SO is using the ProVoice system which nobody has a scanner that will decode it. I wish somebody would figure it out so we can listen to it.