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.
So by “magnetic” do you mean “active”?
Thanks…