Various methods for allowing a due diligence service provider to assist a financial institution with a regulatory or statutory compliance requirement are disclosed. The plurality of frequency components is divided by the energy value for the frame to form energy-normalized frequency components. In accordance with the recording tape cassette, conveying stability of the recording tape trained around on the guide roller can be ensured. But this solution adds cost to the recording devices, which will not be accepted from all potential buyers as only a small number of the buyers will actually use this functionality.