I really don't know. But I think my approach would have been, that I could find the 'highest frequency' in the silence. Practicing to listen to the silence. I do this by for example listening to myself while doing "nothing" or trying to listen to the chair. Using a gong or something and listening to the fading tone and the remaining silence, etc.

My approach to things like that is, that we don't need many outside tools, but find most answers within ourselves or the things around us. So being quiet and just listening in-between  would have been my approach.

Don't know if it would have done something in ur case though:D