The idea is good but the gimmick is extremely cheap and it won't work for accomplishing this effect.
The main problem is that everyone would ear the music, even from 30 feet away! I suspect that the
clips on the video promo are accomplished with a different method. The instructions are very basic
and you learn nothing more than what you already figure out yourself before buying it... If you are
expecting to receive any tips or advise, you will be more than disappointed! I emailed the author
about a gimmick issue but he never replied, even if he promise to answer all client's concerns on
the instructions sheet.In other words, keep away from that way overpriced and unfinished effect.