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We discuss the contributions of a ubimus-oriented artistic project - Maxwell's Demon (The Maxwell Demon) - highlighting the specific challenges of lay-musician interaction. Using the MoMuPlat environment, we implemented the TMD sound-synthesis tool for portable and fixed devices. Five musicians and three lay people of both sexes participated in the study, targeting improvisational group activities based on simple verbal instructions. Through interviews with participants, on-site observations and analysis of audio and video recordings, we obtained results that indicate advantages and limitations of the knowledge-transfer strategies applied during the activities. The items covered include, on the one hand, problems in the activity-preparation stage; the generation of new materials was encouraged but the reuse of sound resources was low. On the other hand, the participants' body movements served to expand their creative engagement; the layman-musician interaction was effective in establishing a common mechanism for participants with and without specific training. Overall, these results indicate that it is necessary to develop design strategies focused on making the knowledge explicit or supporting the transfer of tacit knowledge necessary to achieve creative group results.