However, I think you have something else in mind which is that there is somehow something left out when I explain it by simply appealing to signal processing. In that sense,

I don't have anything else in mind that I know of. "Explained via signal processing" seems basically sufficent. The interesting part is "how can you look at a given signal-processing-system, and predict in advance whether that system is the sort of thing that would talk* about Qualia, if it could talk?"

(I feel like this was all covered in the sequences, basically?)

*where "talk about qualia" is shorthand 'would consider the concept of qualia important enough to have a concept for.'"