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);    }