How come the "FBS Enable" button is not present on certain channels I've created? It seems that this button is only present on "vocal presets" for my setup but obviously I would think it would be present for input channels such as: acoustic guitar/bass/etc. that I would also want to have FBS for. I'm sure it's a simple fix/answer but cannot find in the FAQ's or on this forum someone having this problem/ignorance that I'm having. thank you in advance :)