void setSample(int sample, int step) {
  if(setErease) {
    for(int i=0; i<matrix[1]; i++) {
      pattern[sample-1][i] = 0;
    }
    setErease = false;

  } else if(selectPattern) {

    loadPattern(sample);
    selectPattern = false;

  } else if(selectBank) {

    loadBank(sample);
    selectBank = false;

  } else {

    pattern[sample-1][step-1] = 1;
    for(int i=0; i<matrix[0]; i++) {
      for(int y=0; y<matrix[1]; y++) {
        printf("%d ", pattern[i][y]);
      }
      printf("\n");
    }
  }
}