Hey Kirk!
I'm glad you find this useful :)
If I understand correctly, you would like to view the mix of Signal Generator + Audio File, but here only the Audio File?
In general, I personally have not been using the Signal generator very much (and it even seemed to me that it has a bug where a dot in the zero position is added?), when I play with patterns I usually use PureData and the Microphone section of the scope.
What you are asking for is definitely possible to implement though. If you know JavaScript, you can find the source for this here: git.s-ol.nu/xxy-oscilloscope
(you don't need node, docker or electron for playing around with it, it's enough just to open index.html in your browser)
I'm not sure how interested I am in adding this to my version of the project, I was actually thinking about removing the Signal Generator altogether in favor of making it purely an output display.