http://www.radioreference.com/apps/db/?ctid=1513My home page here shows that Dunklin County had updates on 08/22/08. I can't tell what was updated. I hope someone can tell me.
I bought a used Pro-2055 today from eBay. Now I get to learn how to program it.You are correct - two agencies can use the same frequency and not interfere with the other.
But a digital scanner is NOT needed, it has nothing to do with digital. Most/ if not all newer scanners have this ability.
I recommend reading the Wiki for more info. http://wiki.radioreference.com/index.php/Continuous_Tone-Coded_Squelch_System