The study of the Dunhuang pipa scores, a set of manuscripts from Xth century, written with a system of tablature for the pipa lute, has been facilitated by the development of a dedicated software program. It performs their trans-notation on five lines scores, allowing to obtain different results, depending on the selected input configuration parameters, like tuning and rhythms. This program also produces schemas and diagram for melodic analysis purpose. This has proven useful to evaluate and validate various hypothesis concerning the original scores, and to identify their mode. Finally, the obtained results can be validated by their interpretation on a real instrument.