Hello. I'm pretty new to the scanning world. I'm using a PRO-164 and I come seeking knowledge! How do I know if I should use CTCSS or DCS for a frequency? It seems that for most of the Police or Fire frequencies if I use CTCSS, a code will show up on the display and when two parties are talking a little lightning bolt shows up at the bottom right side of the screen. Should I "save" the code then or just allow it to search each time for the CT code?