I've done a lot of DPS listening in the last few months. Seems like the most-common patches for the purpose of using fewer dispatchers puts Metro East and South together, as well as 6 and 4, 8 and 9, 11 and 3 with on rare occasions 2 also. I have heard 12 exactly once, and even caught 1 in there not too long ago, but I missed getting what channel it was on. I've never noticed 5 changing, but what I have noticed is 5 and 14 using different sites because of changes in signal in the middle of calls. I've also heard individual cars talking to each other on the South output frequency (car to car channel?) All this from my QTH near Combs and Schnepf using a BTech 6X2 (I love the sound quality vs. a BC436 and the scan isn't terrible) and a homemade dipole sitting up near the ceiling.