try{
  ShortMessage noteMessage = new ShortMessage();
if (!mousePressed){

if (lastnote!=-1){
  noteMessage.setMessage(ShortMessage.NOTE_OFF,0,lastnote,lastvolume );
          receiver.send(noteMessage, -1L);  // send it now
  lastnote = -1;
  lastvolume = -1;
}
}

else if(mousePressed){
  int note =(int)((float)mouseX/(float)width*127.0);
  int volume = 127-(int)((float)mouseY/(float)height*127.0);

if (lastnote!=-1){
  noteMessage.setMessage(ShortMessage.NOTE_OFF,0,lastnote,lastvolume );
          receiver.send(noteMessage, -1L);  // send it now
  lastnote = -1;
  lastvolume = -1;
}

lastnote = note;
lastvolume = volume;
ShortMessage newMessage = new ShortMessage() ;
newMessage.setMessage(ShortMessage.NOTE_ON,0,lastnote,lastvolume);
receiver.send(newMessage, -1L);  // send it now

}
  }catch (InvalidMidiDataException ix) {
    System.err.println("InvalidMidiDataException: " + ix.getMessage());
  }
}