Kenny makes his own ringtones and wants to know how to quickly review each one. Leo says that iTunes will play them. He can also add them to his phone and run through them that way. He can use the search function on his PC to play them with any audio software like WinAmp. He can also search for them all and just play them one after another. VLC and Quicktime will both be able to play the files. Anything that can play back an M4R file will work.