I am trying to mix a project for a client. All the stems he sent are stereo files even though they are mono recordings. I want to bounce them to mono. So can somebody tell my why the mono/stereo button is there on some audio tracks but not on others. As you can see from the image two of the purple electric guitar tracks are showing this button but above it the brown ac gtr track isn't and I don't know how to get it to appear. I'm sure the answer is simple but as always the Studio One Help file (which is by far the most useless Help file of any software I have ever used) gives me no help at all. So any help would be much appreciated. Also on those tracks the record and input monitor buttons are missing too. Cannot work out why this is happening.