I've never seen that ritual instrument in use in relation to any Shingon ritual. AFAIK, it is not used in Shingon at all. This ritual instrument is mainly associated with the Tibetan chod གཅོད (gcod) ritual and a ritual like chod doesn't exist in Shingon.
Now, observing with the eye of the Buddha, both the Buddha and ordinary beings are in the same liberated state. There is neither this nor that: there is only non-duality and identity.
- 空海 Kūkai 弘法大師 in Unjigi 吽字義 The Meaning of the Letter Hūṃ
new translation: Kūkai on the Philosophy of Language by Takagi Shingen and Dreitlein Eijō
Our life is very simple, very direct, very beautiful, very vast and very terrifying, but it is not at all convenient.
- Anzan Hoshin Roshi