darkwolf -
You sent me a PM and my reply bounced because you haven't set up your account to receive PMs. My answer to your question about feeds is below:
Those feeds come from one of two sources: a scanner that has been tapped at the discriminator to take raw audio to a computer sound card that can decode it through software or they have bought an EDACS ProVoice radio that is programmed for that system. I know at least one member here that has one of those radios.