How to play an instance of a sound in a soundchannel

I have some sounds in my library that I want to play in a soundchannel, but how? This is what I have so far:

var music:Sound = new Sound();
var channel:SoundChannel = new SoundChannel();
var sTransform:SoundTransform = new SoundTransform();
var sound:SoundFile1 = new SoundFile1();  // Note: SoundFile1 is a class; in it is my soundfile in the library
// music.load(sound); ??
channel = music.play();