Abstract
In 1974–77 I developed the MIDIM8X system for digital musical composition and research. It is a software package for controlling a pair of VOSIM7 hardware generators. MIDIM8X is conceived in terms of an interpreted formal language. In this paper the language will be presented in an analytical way in order to keep it independent of its material realization. A new MIDIM9 system based on this language is on the way to be implemented.