I just know that because there are some stadiums that do not have enough supporters, but the cheers sound already full lively with drum strings also.
what do you think?, is real or use recording through speakers
The answer is yes, maybe the supporter's voice is just using a tool, but not all matches in every league.
Even if it is not real, but it is quite good to enliven the atmosphere of the match.
Rarely do people watch football matches or other sports matches that are not full of spectators such as the English Premier League or La Liga on live broadcasts that are broadcast paying attention to the same audience voice throughout the match.