private byte calcChkSum(Patch p, int start, int end) {
private static byte calcChkSum(byte[] b, int start, int end) {
  private byte calcChkSum(Patch p, int start, int end) {    int sum = 0;    for (int i = start; i <= end; i++)      sum += p.sysex[i];    return (byte) (-sum & 0x7f);  }