@Abarsanti: Thanks for posting your comments! FWIW, I don’t use the MoreSoundBooster very often, but it does work.
Earlier this spring, when i was barely 6 weeks into my BrainHearing retraining, my wife asked me to step onto the porch and see whether I could hear the peepers. I couldn’t, unless I turned the volume of my DSL program up +3 clicks, in its usual omnidirectional mode.
However, when I experimented and turned my volume back to 0, and activated MSB, I was able to distinctly hear the peepers in a very narrow (5-10 degrees of arc) "window ".
The frogs seemed to reside in the soggy ditch behind my neighbour’s shed, which is - logically - where one would expect them to be. I was able to replicate this finding on 4 other occasions.
So, MoreSoundBooster seems to work as an extremely tightly-focused beam former (which has limited practical applications for me).
You might want to try out a similar experiment for yourself. I am interested in reading your findings.