Hello, I have a four input prenup plugged into my computer. I plugged to microphones and an electric guitar into three of the four no matter what setting I use for input for example input one, input two, input three logic will record if armed, for instance, logical record on track for input for even with absolutely nothing plugged into it if I want to record a voice on track two will also show up on track three which is said it input three for the electric guitar and track four, which is blank. I know there must be some setting. I’ve thought about stereo versus mono settings versus Mike settings. You would think that I would just be able to plug in three different inputs arm, each track and record. Any ideas for me to check on?