Maybe I just have to start again, and I don’t mind adding everything manually, I gather this is more reliable, but I’m not sure of what exactly to write, and I’d rather troubleshoot my tools for the next time. Any help is greatly appreciated.
The helper.py script can help you get started the first time, but it’s a very limited tool. You can’t update existing code with it; it will overwrite your existing code if you let it. My sense is that most developers quickly abandon helper.py once they start getting their first module working.
Rack offers useful but limited support for SVG rendering. I don’t believe it can handle PNG or BMP images embedded inside the SVG. You will need to create your logo as vector art.
To understand exactly what Rack’s SVG renderer can and cannot do, take a look at the source code file Svg.cpp, especially in the function svgDraw. It mostly handles shapes, paths, linear and radial gradients, and basic colors.
I can confirm that this is true. It is possible to render a second .png or .jpg “layer” to your module’s panel, but it’s quite involved and rarely done. But as Don suggested, if you can convert your logo to vector art, you’ll have a much easier time.