I will name this Shitro practice The Profound practice of the Peaceful and Wrathful Deities that Liberates on Hearing and I will bury this as a treasure to be discovered in the future
The lineage of this Shitro practice is the same as the lineage of Dzogpachenpo. In the Nyingma tradition, in each Tantric practice, there are transmissions of three lineages; the mind lineage, the symbol lineage and the hearing lineage. I will explain more of the hearing lineage of the Shitro practice.