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);    }