My group of first graders this year are so LOUD! All the time - even when they're allowed to work together. Their voices all seem to carry on top of them just using a high volume. I've read Decibella, tried many reward systems and consequences, practiced things like reading and math centers daily, praised students who were doing a good job...nothing works for more than a few minutes. They're so loud that I have a hard time hearing the students at my guided reading table during centers - and that's when I have 8-10 students in headphones on ipads or chromebooks. I am constantly having to stop and redirect the whole class or individual students. It's mostly not a behavioral issue, so I'm really struggling with how to correct it. Any advice?