INTRODUCTION: Starting from et ego. a piece for classical guitar and electronics. this paper aims to introduce the notionof the interactive system as a tool to understand the musical activity developed by a composer and/or performer inrelationship with an instrument and a score. OBJECTIVES: The primary objective is to show how the equilibrium within this interactive system can be affe... https://www.chiggate.com/color-charm-050-cooling-violet-supply/