In the Palermo match only 100 out of 1000 where singing i.e. there where 100 ultras that know all chants (me one of them
) while the other 900 where normal supporters.
Obviously when you play away the home team is heared more because they had more people singing and booing us.
As Gio said when we play at home only the curva sings (about 8000 people). Others sing simple songs mainly at the end of the game.
Then obviously a lot depends on the performance of the team. If the team does well ultras sing more.
Ultras rarely boo a Milan player e.g. Crespo was booed when he was not scoring by normal supporters. Ultras tend to be more patient but when their patience end huge demonstrations are made. I remember well the season 1997-98, in the last home match vs Parma ultras protested by booing players, saying that they wanted only money and once they showed their back to the pitch.