I have to say, after reading this thread(and understand, I am not at all perfect at radio programming), but you can VERY easily scan and NOT miss anything on your main channel....It all depends on the model of the radio, (AN, BN, CN, DN)...The newer generations, DN/DN, all you have to do is go under your radio config menu and set the scan settings to enable priority scan and enable the pri scan channel beep, set the timing of the radio to in seconds(05 and up), to revert back to the priority channel you have selected(there are different settings...Fixed, meaning you set only 1 channel out of the 16 to be the pri channel, user sel, meaning whatever channel the channel selector is on, is the pri channel....If you start out as Ch 1, in my case, is our county fire dispatch channel, that will throw the page out via tone and tell us where the call is and the nature of the call and what tac channel to use....Then, you keep it in scan if you want, I do...I switch to the tac channel that we were advised to do, which let's say tac 2, so I switch to channel 3, channel 2 is tac 1, FD dispatch is ch 1, and while scanning, my pri channel now becomes ch 3, because I have my pri scan settings as user selectable, therefore, I can still scan all 16 channels, or however many you want to have scan(you can change what channels you want scanning in your scan menu), and while scanning all 16 channels, as soon as the radio detects traffic on ch 3, it will beep, letting me know that traffic is being emitted on ch 3(pri channel), and as soon as the traffic is done and the tot (the time it takes from after radio traffic stops, until the time is starts scanning again, it will then start scanning and continue so on...and when we go assignment complete, we will return to ch 1, FD dispatch, including our handheld radios, and once we turn the channel selector knob back to ch 1, that now becomes our pri channel again until the next call....basically, you will not miss anything if you using pri scan with user sel channel setting as your pri channel....now, again, you will have to set the time that the radio looks back at the pri channel for radio traffic while in pri scan mode, which we use 05 sec, which you can actually hear the radio clicking real fast when there is radio traffic on a non pri channel, you will hear it skip real fast, that skipping is the radio reverting back to check the pri channel to see if traffic is being emitted.....I know this looks confusing, but in reality, it is very simple...I have my toggle switch set as follows...Toggle "A"-pager alert(OR), meaning the channel signal option is muted until our house tones go off, then the radio beeps and opens up to hear everything, until you reset it...then it mutes after you reset it...Toggle "B", channel monitor..meaning that while the toggle is on B, it will only monitor the channel that the selector is on, and it stays open(AND) so you hear everything, and Toggle "C", Pri scan...again, meaning that whatever channel the channel selector is on, is the pri channel, and it is also open(AND) so you can hear everything...Now, there are some other settings, like you side programmable buttons...I am not going to into all of them, but you could set one of those buttons to scan, and other options...ours are set up for side 1, the blue button, is the nuisance delete, meaning that while scanning, if a channel has a lot of traffic on it, and you start to get sick and tired of hearing it, you can push the blue button while the channel is actively talking and it will temp delete it from the scan list...now, remember, once you do anything to the radio...push the PTT button, change a channel, move a toggle switch, turn radio off/on, ect, that channel will be back in the scan list again and you will have to push the nuisance delete button again if it get;s annoying again....I use it a lot on our PD Ops channel when they aren't busy with calls, and they will just set there and run plates and DL's, and it can get very, VERY annoying listening to dispatch running plates, VIN's and DL's and reading them back to the officers, I will just push the blue button and that temp deletes it....the orange button on top is our emerg man down button...self explanatory...But I guess my point is.....Using scan is not at all a bad thing...just as long as you know what your doing when you program it...If it's programmed like our's, you can scan all day long and not miss one bit of radio traffic on your pri channel....just wanted to throw that out there...