I couldn't find a pair of panty hose the other night, so I used a pair of my old hole riddled underwear (clean). I didn't really notice any difference, and I got to give those faithful old undies a final serenade as farewell...
the type of machine you use is not relivant, its the type of mic. a condensor mic must have one, and keep a distance from it when you sing, the close proximity of your mouth and the force of air damages the mic