Unwanted connections

Every time I open one of my qtractor projects, the first thing I need to do is to disconnect "Built-in Audio Analog Stereo" from qtractor's Master/in.

I can't find any way within qtractor to remove this automatic connection, and I remember Carl Irwin mentioning in one of his video tutorials that qtractor always makes this connection whether the user wants it or not.

I tried deleting the relevant parts of the <input-connects> section of one of my .qtr files, but that didn't help, so it rather looks as if qtractor doesn't actually refer to this part of the file.

Is there a way of stopping qtractor making this connection whenever a file is opened, or is there some reason this behaviour has to be there?