An apparatus for transforming data input by dividing the data input into a uniform dataset with one or more data divisions, processing the uniform dataset to produce a first processed dataset with one or more data divisions, processing the uniform dataset to produce a second processed dataset with one or more data divisions, wherein the first and second processed datasets have the same number of data divisions, and editing data selectively within each one of the one or more divisions of the first and second processed dataset. This apparatus has particular utility in error-spotting in processed datasets, and toward training a pattern recognition application, such as speech recognition, to produce more accurate processed datasets.