I would recommend using Freescan programming software. Program just one trunking system, Motorola Type 2/P-25. Enter the following 2 frequencies for your control channels, 860.2375 and 860.2125. Be sure to set it to control channel only in the software. Then program in the 2 talkgroups you want to monitor;
Chatham Fire - 37360
Chatham Police - 38192
If you still have problems, at least download the software I mentioned above (it's free), and I can send you a complete file for Cape Cod, then you can just lock out or delete the talkgroups you do NOT wish to monitor.