- [ ] Shakuhachi (this might be too difficult) - [ ] https://www.researchgate.net/profile/Shigeru-Yoshikawa/publication/266676332_Acoustics_of_cross_fingerings_in_the_shakuhachi/links/5437664d0cf2dc341db4d697/Acoustics-of-cross-fingerings-in-the-shakuhachi.pdf
