Yup. I had posted it to Wilderness Soundscape Challenge (August 2024) - #7 by john_rose
I forget what you call the chord that the REFTONE modules make.
If the youtube video doesn’t cooperate, here’s the bare link to it:
https://www.youtube.com/watch?v=aEr2O33iEuk
The NYSTHI PVM meter (in the upper right) indicates the levels of the frequencies adjacent to the main one at any given time. That was what SCANNER made possible, with its Width and Slope knobs.