Andy…is this (link below) what you mean by “magnetic buzzer”?
After more research, (check me) it seems like Pixhawks use “passive” / piezoelectric buzzers (which act kinda like a speaker) that are controlled by PWM signals (and can play many tones), while the Betaflight-type boards are meant to use “active” buzzers which only use voltage (and no PWM), and only play ONE tone.
I have active magnetic buzzers which still play a tune. I think AP can use either, the only thing is that the active ones appear to play a continuous tone at startup. So I’m sure those will work, how well is anyone’s guess.
Hey @andyp1per, I am experiencing this situation you’re mentioning above. Buzzer plays a continuous tone at startup then does the traditional Arducopter start up tone. Do you know if there’s a way to avoid that?