0 vol  0.0;
1000 freq 440;
   0 vol  0.8 2;
 100 vol  0.0 2;
 900 freq 440;
   0 vol  0.8 2;
 100 vol  0.0 2;
 900 freq 440;
   0 vol  0.8 2;
 100 vol  0.0 2;
 900 freq 880;
   0 vol  0.8 2;
1000 vol  0.0 2000;