var tempo : Number = 120.0;
 
// Create midi patterns defining tempo and steps (quarter notes count) for each
var loopPattern : Pattern = new Pattern( tempo, 32 );
loopPattern.addStep( 0 );
 
var kickPattern : Pattern = new Pattern( tempo/2, 16 );
kickPattern.addSteps( 0, 3, 6, 8, 11, 15 );
 
var snarePattern : Pattern = new Pattern( tempo/2, 16 );
snarePattern.addSteps( 2, 4, 12, 14 );
 
var hhPattern : Pattern = new Pattern( tempo, 16 );
hhPattern.addSteps( 0, 2, 4, 6, 8, 10, 12, 13, 14 );
 
var randomPattern : Pattern = new Pattern( tempo );
randomPattern.addSteps( 1, 3, 5, 7, 9, 11, 13, 15 );
 
// build core audio station and add audio tracks defining volume and pan
_audioStation = new AudioStation( );
_audioStation.addAudioTrack( new Track(new SoundSequencer( Loop1, loopPattern ), 1, 0 ) );
_audioStation.addAudioTrack( new Track( new SoundSequencer( Kick1, kickPattern ), 0.3, 0 ) );
_audioStation.addAudioTrack( new Track( new SoundSequencer( Snare1, snarePattern ), 0.3, 0 ) );
_audioStation.addAudioTrack( new Track( new SoundSequencer( HH3, hhPattern ), 0.3, 0 ) );
 
// create some randomness trigged by keyboard events.
var soundList : Vector.<Class> = new Vector.<Class>();
soundList.push(Kick1, Snare1, HH1, HH2, HH3);
var interactiveSequencer : RandomSoundSequencer = new RandomSoundSequencer( soundList, randomPattern );
textfield.addEventListener( KeyboardEvent.KEY_UP, interactiveSequencer.eventTrigger );
_audioStation.addAudioTrack( new Track( interactiveSequencer, 0.3 ) );