This invention allows for easy field-customization of mainstream and exotic electronic musical instruments, in isolation or in support of the easy creation of aggregated instruments. The invention further facilitates entirely new manufacturing, marketing, and sales paradigms permitting a broad range of open industry development and commerce, thus making an individual musician's creation of new exotic instrument arrangements an economically viable sector for both mass manufacturing and the niche cottage industry. New opportunities are provided for the creation of multiple-vendor standardizations, multiple-vendor manufacturing, multiple-vendor competitive features, etc. while offering the music equipment user and music industry as a whole access to an extensive range of instrument customization, diversification, and education. The principles of the invention thus create a rich environment for instrument, user, feature, music, and market.