The topic of this thesis is interdisciplinary and therefore the research objective is twofold. On the one hand, it demonstrates the possibilities of using digital tools to help archivists describe archival records in a more detailed and accurate way. At the same time, it describes one of the ways in which digital technology can help historians to facilitate and accelerate their research process. Focus is on the 1990 pre-election campaign as an important segment of the first multi-party elections in the Republic of Croatia. Source for the study are archived recordings of the Radio Zagreb. The reason why this type of records was chosen is the lack of scientific research associated with radio in contrast to other mass media. Firstly, historical and political background of the mentioned period is defined. The political and economic crisis in SFRY is described, after which the study turns to the situation in Croatia. The starting point is the establishment of political parties, which is followed by a description of the preparation of multi-party elections and finally presentation of the most important characteristics of their results is given. Practical implementation of the research begins with technical data linked to the used recordings. These refer to media preservation, length of the recordings, and sound quality. This is followed by the description of the two types of digital tools used for the analysis. The first is a tool for converting audio to text, and the second is a tool for text analysis. Finally, the tools are applied to the selected recordings and the results are interpreted.