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 28-43HERE(sounding result = transposed, which means a none up) •all recorded by Harry SparnaayLISTEN •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