public void calculateChecksum (Patch p) { YamahaMotifSysexUtility.checksum( p.sysex );
public void calculateChecksum (IPatch p) { YamahaMotifSysexUtility.checksum( ((Patch)p).sysex );
  public void calculateChecksum (Patch p) {    YamahaMotifSysexUtility.checksum( p.sysex );  }