public void calculateChecksum(IPatch ip, int start, int end, int ofs) {
public void calculateChecksum(Patch ip, int start, int end, int ofs) {
    public void calculateChecksum(IPatch ip, int start, int end, int ofs) {    		Patch p = (Patch)ip;    		int sum = 0;        for (int i = start; i <= end; i++)            sum += p.sysex[i];        sum += 0xA5;        p.sysex[ofs] = (byte) (sum % 128);        // p.sysex[ofs]=(byte)(p.sysex[ofs]^127);        // p.sysex[ofs]=(byte)(p.sysex[ofs]+1);    }