I tried to compose something for 2 shamisen and at the end it finished in a crab canon
You can hear the preview in western notation on Musescore:
https://musescore.com/arcandius/shamisen_crab_canon
Maybe in the future, Musescore will natively support Shamisen notation, but currently you can use my debug version with the link below:
(Made on Musescore: https://community.bachido.com/t/musescore-shamisen-font/4794/12 )