However, it is no problem asking that question, mate. It is normal if someone is curious about the crowd sounds of supporters while the regulation didn't allow the supporters to go Stadium. Regarding it is a fake or artificial supporter sounds, maybe @blue Snow really doesn't know about it yet. Most people only know the artificial supporter sounds on PES, it's a game. But for real matches, he may never imagine if it is using fake/artificial supporter sounds as well. So, don't be so surprised!