Andy,
The setup is one scanner with the two frequencies in it my FD on ch 1, EMS and a second FD on ch 2, connected to single PC (Vista SP2). My tones are A: 2359.8 B: 716.2, EMS A:473.0 B: 716.2, 2nd FD A: 1900.2 B: 1285.0. A & B tone length is set at .6, record delay 1.0 and ignore after 60 in Tone Editor. Record time 30 seconds, release time 0.0, tone tolerance 2.0, tone offset 0.0 in TTD. Normally dispatch will pause after setting one tone set off, allowing the scanner to shift freq. and pick up the second, then send out both messages. I did see this happen on a couple of calls and thought this is great. The only thing I can think of would be to close down the squelch on the scanner a little.
Sparyky604