From the Publisher
"In Impulso I regarded the flute as a person who appears and asks a short question in front of the public. This question is followed by a statement. And when the question is asked again, it is again followed by this statement, and the whole development of this work happens through increasingly precise paraphrases to which new ideas are added which are presented like a lyrical development and like a constat amplification."
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).