In Vajrayana refuge visualizations the back petal of the refuge tree has volumes of the Buddha's speech pilled high like a mountain emitting sounds (actually proclaiming the Dharma) and that visualization also has Dharma birds chirping Dharma and when wind blows the sounds of Dharma are spontaneously emitted.
These sounds are emitted as the visualization takes place in a Pure Land and these are attributes of these kinds of experiences in the Pure Lands.
Kirt

