Siren gives 1-second shriek when system armed

This is an Ademco Vista 20P. When I arm the system in Away mode, the siren shrieks once. How can I turn this off?? I tried setting *37 to zero, but it still does it.

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Injun Ear
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37 is the audible exit warning...beep on keypads 38 is the siren chirp confirmation of arming and I believe the transmission of the closing signal being sent.

turn off 38

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