We would love tips on Listening Concentration

I sought help regarding visualization and received some cool tips. I loved the help. I am training visualization and auditory concentration at the same time. Not only me, but many experts would like tips regarding auditory concentration as well. Tell us what you did to gain proficiency in this skill, what you did, etc. Would it be worth it?

Bardon says to remember the sound. I'm using the ticking sounds of a clock and bell at the moment. What would “remember the sound” mean? I force my mind to tick. Should the sound come spontaneously without my interference? Good practices to everyone!