> A particular oddity of a lot of these systems is that they have different generations of receivers that use different methods, so sometimes you'll end up hear

> A particular oddity of a lot of these systems is that they have different generations of receivers that use different methods, so sometimes you'll end up hearing the tones played aloud if a receiver opens squelch in reaction to something earlier in the sequence. Good grief, I'm getting old... First thing I thought of after reading that: https://www.youtube.com/watch?v=obkpqUyfYks&t=26 https://www.youtube.com/watch?v=obkpqUyfYks&t=26