I have a Presonus studiolive III 32sx soundboard networked to two stage boxes and a earmix 16. I don't feel that studio one is an option as the computer is currently running at max capacity with ProPresenter. We are getting a lot of feedback in the system and sometimes I cannot make it loud enough to be audible by all people in the congregation. (Congregation says that the Sound levels during the sermon are not loud enough and that the musicians are too loud). The biggest problem are the hard walls in the church. However, I can't fix that right now. I need to be able to tune the mixer somehow to get less echo and tinny-ness that ultimately leads to "feedback" screech in the audio system. Thank you in advance for your help.