Here is a demo of the spiral generator with all six control input features working reasonably correctly, as far as I can tell.
rock and roll
https://www.youtube.com/watch?v=MaXHj5reCjk
Some flattening asymmetry is seen when the spiral sweeps left, which still needs investigation.
Here's a list of the bus activity of the red channel for this song. The inverted spiral XY signal is available, but it can be seen that inverted spirals do not appear on the red channel during this number.
bus activity for red channel (song begin to end):
image source: 3 triangle audio mod
image source: 0 fixed cycloid
image source: 3 triangle audio mod
image source: 0 fixed cycloid
image source: 3 triangle audio mod
image source: 0 fixed cycloid
image source: 3 triangle audio mod
image source: 0 fixed cycloid
image source: 3 triangle audio mod
image source: 0 fixed cycloid
image source: 4 variable cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid
image source: 4 variable cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid
image source: 1 spiral / diamond
image source: 0 fixed cycloid