Get the service manual from http://www.agtannenbaum.com/
It has all the information you need to change the actavation tones and add a relay output to triger firehouse bells or a fire siren and such.
I have the service manual for the "cheif" model recivers and it was very informative.
I was able to make the optional board of the Relay switched output from the scimatic. It also has charts to select the proper capacitiors and inductiors for the proper actavation tones.
Connie F.
[email protected]
Plectron service manual
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