public DrumStart(DrumPitch drumPitch, int velocity) : base(drumPitch)
{
this.Velocity = velocity;
}
public Drum(DrumPitch d, double noteLength, int velocity) :
base(new DrumStart(d, velocity), new DrumEnd(d), noteLength)
{
}
public DrumEnd(DrumPitch drumPitch)
{
this.DrumPitch = drumPitch;
}