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Is it possible to have on /off wifi controlled speaker sound on a flying phantom 4
Not using the existing hardware. You could rig up your own independent wifi link with assiciated hardware but unlikely worth the effort. Look at all the weight saving evident in the design, you will greatly reduce flight characteristics and airtime.
Ok, is it possible to turn the beeps that the drone makes at startup on and off in flight when required and are these the only sounds the rotor engines can generate
Almost certainly no....
Tell us more about your requirement.