1. Department of Computer Science, Mathematics and Physics, Università di Udine, 206 via delle Scienze, Udine 33100, Italy
2. Institute for Computer Music and Sound Technology, Zürcher Hochschule der Künste, 96 Pfingstweidstrasse, Zurich 8048, Switzerland
3. Department of Information Engineering, Università di Padova, 6/A Via Gradenigo, Padova 35121, Italy