Key noises
Bisbigliando
Glissandi
Harmonic fingerings
Quarter tones by fingering
Microintervals
Double trills
Multiphonics
Rough multiphonics - 0:12:55 - 0:13:03
Strident sounds - 0:13:03 - 0:13:15
Soft double sounds - 0:13:15 - 0:16:30
Advice on Peter Vaele's book
About Holliger's Studie über Mehrklänge
Studie über Mehrklange of Holliger - 0:18:10 - 0:19:00