The thesis aims to establish a methodology for developing software prototypes within a community of experimenting musicians. The initial focus is on how information is collected and implemented through iterations in a functioning prototype. In addition to processing empiric and theoretical data, the thesis describes the construction of three prototypes which are developed in the process. The scope of the prototypes is to investigate modification of sonic material through visual and tactile interfaces. Blender and Python are the primary technologies behind the interfaces, used to ensure the synchronisation of audio and image. The prototypes are evaluated in the context of active musicians, regarding to which degree it makes sense for a musician to incorporate the design concepts in a given workflow or situation. The thesis explores topics on how online and situational test information is used to generate new iterations of music interfaces. Companies that produce music software deal with a fluctuant consumer group which often proves to be hard to analyse. The thesis investigates corporate possibilities to adapt analysis models for fluctuant tendency groups such as musicians.