Multiphonics, dyads

for tips about playing and or adding multiphonics or dyads in your composition:

Harry Sparnaay
From the book The bass clarinet, a personal history (2012) by Harry Sparnaay
•techniques with tracklist 1-27 HERE
•list of multiphonics tracklist 28-43 HERE (sounding result = transposed, which means a none up)
•all recorded by Harry Sparnaay LISTEN
•fingerings high notes HERE
Note:
I decided to share the material here since to book isn’t for sale as pdf and the physical book is €80. Harry Sparnaay would have wished that the material is within reach for everyone. Use it, do not ‘through’ it on socials. If you have the means: buy the book, very nice to read. 

Resources for composers by Heather Roche -> LINK
I like especially her list of dyads for clarinet (also notation = transposed) -> LINK

Caerulean by Rebecca Saunders (2011) performed by Carl Rosman, with score follower and in the end fingerings for all the multiphonics and dyads

Tõmba Tõmba (2014) – Tobias Klein, performed by Fie Schouten
sheet music
https://webshop.donemus.com/action/front/sheetmusic/14836