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I'm pretty well versed on the TM4 but I'm curious how agencies are achieving a much shorter wail in their sweep function on the old school Touchmaster (not the Delta). Like in this clip of a Tulsa Police pursuit. Their wail tone in the sweep mode stops just short of peak before cycling to Yelp...

Long time reader... new member. Need some advice, tried a search already without luck and do not want to bother the sole Touchmaster tech at Fed Sig. Apologize if post is a bit long but I want to provide as much info as possible to save others effort. Have a Fed Sig Touchmaster TM4. Not a...