you are looking for a very select group of people
In the 206 I fly, after landing and winding down the throttle the horn will go off, so I mute it. Then as I roll the throttle off the throttle the horn will sometimes go off again but not always, dont know why. It is a modern B3 and doesnt have a seperate audible low rotor horn. Some I have come across have two separate tones that you can test by raising the collective at ground idle. This one is on if the rpm is below 90, hence the mute. Most older (early 80's) B3s dont have mutes so you use the circuit breaker until started/once stopped. This probably wont help!