That particular shader is multi-buffer (in this case 2). Magic doesn't yet support multi-buffers. There are many shaders like this so I think it is on the Magic radar but Merlin knows when.
However, you can grab the ribbons from Buf A into a GLShader file and it will partially display. Give it an AudioToImage and it will even react. I think it gets some anti-aliasing and some glow from the second shader but (IMO) it looks fine without. It is quite intensive on the GPU though.
Does somebody maybe know if its possible that the scene's in the playlist are going Randomized on the beat?
I really dont know how I can explain it, Hopefully somebody understands me.