During the European project Semantic HIFI, a new HIFI system with innovative features was implemented. Among these features is an innovative GUI for browsing inside the music structure. This particular feature was tested during a set of user sessions. The very positive feedback did not conceal several lacks pointed out by the users. For example, users pointed out difficulties to understand the GUI and requested new advanced features. The corresponding specification updates will lead toward a powerful semantic tool for structural browsing including both advanced intra and inter audio structure browsing, as well as P2P meta-data exchange possibilities.