Nice, I assume this is XY-mode by stereo channel.  I did a little writeup here: <a href="http:&#x2F;&#x2F;cookingwithsound.com&#x2F;an-xy-mode-oscilloscope-in-your-browser&#x2F;" rel="nofollow">http:&#x2F;&#x2F;cookingwithsound.com&#x2F;an-xy-mode-oscilloscope-in-your-...</a><p>If you want to get in touch, I&#x27;d love to add more detail about how the code works :)