Vijnana Bhairava Tantra · Dharana 18 · Verse 41
Last fade of an instrument
Listen to a single long note from a string, a bell, or a bowl. Ride its decay all the way down. Do not jump ahead, in the mind, to the next note. Follow the thinning end of the sound until there is only space. That last thinning is the meditation.
Older line
Listen with undivided attention to the long sounds of a stringed instrument, or any other, following them through each stage of their fading. At the very end, you take on the form of the supreme space.