protected static void calculateChecksum(Patch p, int start, int end, int ofs) {
protected void calculateChecksum(Patch p, int start, int end, int ofs) {
  protected static void calculateChecksum(Patch p, int start, int end, int ofs) {    int sum = 0;    for (int i = start; i <= end; i++) {      sum += p.sysex[i];    }    p.sysex[ofs] = (byte)(sum & 0x7F);  }