A kazoo or a didgeridoo can be used as a makeshift voice changer, though it can be difficult to understand what the person is trying to say.
[citation needed] The earliest voice changers were electronic devices usually used over the telephone for the purpose of disguise.
There are low-priced, small lithium battery-powered voice changers that are used between a phone's mouthpiece and the user's mouth.
[1][2][3][4][5] More sophisticated voice changers have different levels of various distortion effects variable by faders.
The results of voice changing through software are quite impressive and satisfactory.