Paying attention to sounds that come in and out of your attention, as if you're hearing them for the very first time (because you are!). Not separating or identifying the sources of the sounds, but rather, allowing the waves of sound play off your eardrums. In this way there is nothing to hear, but instead, only hearing.
This technique is part of the Expanding phase of SERA, in which the OD practitioner must help participants shift their consciousness into a non-conceptual domain. With expanding the goal is to open conscious awareness further and deeper into a non-conceptual, sensate, and intuitive quality of awareness. In this way, the practitioner helps the client establish a more spacious orientation of awareness, in which sensing is amplified and thoughts are recognized like objects with various levels emotional intensity and attachment rather than truths.
As you think of unique ways to apply this technique to a new OD solution, remember that the aim of the Expanding phase is to stretch consciousness further into non-conceptual, sensate, and meta-egoic forms of awareness.