import javax.sound.midi.*;
import java.io.*;
public class Midimangija3 {
  public static void main(String argumendid[]) throws Exception{
    Sequence sekvents=MidiSystem.getSequence(new File("koduke.mid"));
    Track algrada=sekvents.getTracks()[sekvents.getTracks().length-1]; //viimane rada
    Track uusrada=sekvents.createTrack();
    int nihe=-7;
    for(int nr=0; nr<algrada.size(); nr++){
      MidiEvent me=algrada.get(nr);
      if(me.getMessage() instanceof ShortMessage){
        ShortMessage sm=(ShortMessage)me.getMessage();
        ShortMessage sm2=new ShortMessage();
        if(sm.getCommand()==ShortMessage.NOTE_ON ||
             sm.getCommand()==ShortMessage.NOTE_OFF){
          sm2.setMessage(
            sm.getCommand(), sm.getChannel(), sm.getData1()+nihe, sm.getData2()
          );
        } else {
          sm2=(ShortMessage)sm.clone();
        }
        uusrada.add(new MidiEvent(sm2, me.getTick()));
      } else {
        uusrada.add(me);
      }
    }
    MidiSystem.write(sekvents, 1, new FileOutputStream("koduke2.mid"));
  }
}