I try not to get involved with these sounds but let them come and go. The point is to listen to whatever there is to be heard. At some point I focus on the sound of my own breathing. I become aware of the air as it comes in and as it goes out. I sometimes remind myself that breathing is a natural process which started at birth.
Every breath is an important link in a chain of life.
Gradually I fix all my attention on my breathing to the exclusion of everything else. I breathe slowly and deeply. As I breathe I can feel the air going all the way through my body. With each breath I attempt to push all the air out. The air will come in naturally, so I concentrate on exhaling.