1) This dataset is linked to the Möbius project: The Möbius Project was a European Commission-funded initiative under the Horizon 2020 program, aimed at modernizing the European publishing sector by engaging "prosumers" (consumers who are also creators) and developing new enriched media experiences. Key Information: Project Duration: March 1, 2021 – February 29, 2024 Grant Number: 957185 Links: https://cordis.europa.eu/project/id/957185/results https://mobius-project.eu/ 2)The dataset describes a co-creation and testing session for the Möbius Player during its first pilot phase. It ensured a standardized approach across different research labs, making test results comparable. The main goal is to refine the Möbius Player by gathering insights from participants about their expectations, usability experience, and feature preferences. The protocol includes: Introduction: Overview of the Möbius project, participant consent, and research setup. Evaluating the 3D-audio experience: Collecting feedback on the immersive audio tracks. Evaluating the mock-up: Testing the visual prototype and gathering user insights. Conclusion: Final discussions, participant incentives, and data submission. Moderators’ role & tasks: Responsibilities for leading and supporting moderators. Equipment & tools: Necessary hardware, software, and preparation steps. 3) This dataset is related to the following publication: Immersion or Disruption?: Readers’ Evaluation of and Requirements for (3D-)Audio as a Tool to Support Immersion in Digital Reading Practices. https://doi.org/10.1145/3573381.3596151