Reverberation of Sound

The Reverberation of Sound, or Dratenjur (Tibetan: སྒྲ་ཐལ་འགྱུར, Wylie: sgra thal 'gyur), is the root tantra of the seventeen tantras of the Menngagde approach to Dzogchen.

These tantras are found in the Nyingma Gyubum (Tibetan: རྙིང་མ་རྒྱུད་འབུམ, Wylie: rnying ma rgyud 'bum), volumes 9 and 10, folio numbers 143-159 of the edition edited by Dilgo Khyentse (Thimpu, Bhutan, 1973) of the gting skyes dgon pa byang manuscript.