Those are normal Whelen alternate tones, not unitrol tones.
@EmisSirens2 ай бұрын
Whelen's alternative wail and yelp are based on the tones of the federal unitrol. federal Unitrol had already been around for years with its tones before whelen implemented the alternative wail and yelp tones.
@torontoemergencybuff2 ай бұрын
@@EmisSirens they don't sound very similar unlike the ultra hi lo for example.