I put together a 42-page reference breaking down the factory presets in firmware 3.80:
preset-by-preset signal chain decoding
amp + mic cross-references
routing/topology notes
some designer/artist references
If you’ve ever wondered what’s actually going on under the hood, this might be useful.
Free download:
https://helix.jbarx.com
Optional donation link is on the page, but not required.
Credit to HelixHelp, FluidSolo, and Presonid for prior work that helped inform this.