By building on recognised design for all methodologies, systems should be constructed in such a way that the mainstream solution should be easily adaptable and extensible to add functionality for niche markets. Accessibility can be considered to be an interplay of various processing domains. These processing domains relate to processes in production and perception of musical material. Through clear separation of the technological descriptions of music storage and music manipulations procedures, the ideal 'mix' of the interplay between the processing domains - logical, gestural, visual and analytical - can be described. The process of contriving a procedure to interface the various processing levels should be based on use. The representation of the interplay between the various user groups should always remain accessible. If all relevant entities in a representation system remain accessible, creating meaningful mappings is a matter of connecting the appropriate entities.