Do you ever have those days when you are teaching and you feel like all of your students came to school with cotton balls in their ears? They haven't listened to a thing you've said! Those are my "Charlie Brown" days.
When I talk, I think all my students hear are "wanh, wanh, wuh-wahn, wahn". To help your students tune in more to what you're saying, talk less. Yes, I know another suggestion that sounds counterintuitive. But, try it and see! If you are talking less, guess who is talking more? You got it! Your students will be talking more. Ask more open ended question, get a lively discussion going and you will see more active listening taking place. Think about it from your own personal experience. Do you prefer professional development meetings when it is "sit and get" or "make and take"? Do you want someone talking at you or talking with you?