The author analyses his live electronic work Sentences and develops his principles of analysis: - He makes a distinction between: - "Local controls and functions": the relation between the performer's expression and sound production - and "Field functions which place the result of this activity within a context" - He introduces what he calls appropriate live electronic transformations: - "Mimetic": imitation of an other sound - "Impressionistic": metaphoric imitation - "Synaesthesic”: evocations of colour and physical texture - "Expressionistic": emotional state or feeling