This is fun to see right now. I've been playing around with CRT shaders in retroarch for the last few days. My main goal is to use the [CRT-Beam-simulator](https://github.com/blurbusters/crt-beam-simulator) at 120hz and get some sort of CRT slot or shadow mask at the same time. I've landed on some settings I enjoy for N64 games, and it really has improved the experience for me.
On the post's notes on the Sonic waterfall effect, the [Blargg NTSC Video Filter](https://github.com/CyberLabSystems/CyberLab-Custom-Blargg-NT...) is intended to recreate that signal artifact, but similar processing is included in a lot of the CRT shaders that are available. I found that RGB had a visual artifact when moving that made the waterfall flicker, but composite didn't, so I played on that setting. Running it with the beam simulator is probably causing some of that.
On the post's notes on the Sonic waterfall effect, the [Blargg NTSC Video Filter](https://github.com/CyberLabSystems/CyberLab-Custom-Blargg-NT...) is intended to recreate that signal artifact, but similar processing is included in a lot of the CRT shaders that are available. I found that RGB had a visual artifact when moving that made the waterfall flicker, but composite didn't, so I played on that setting. Running it with the beam simulator is probably causing some of that.