public class MusicPattern {
	/* Pattern definition :
	 *  0 : low  time
	 *  1 : rise time
	 *  2 : high time
	 *  3 : fall time
	 */
	private int[] pattern; // in ms

	public MusicPattern(int[] pattern) {
		if(pattern.length != 4)
			throw new InvalidPatternException();
		this.pattern = pattern;
	}
}