I am puzzled about this as well & don’t see how any of the comments here respond to the OP. Having just paid for Spectralayers Pro 8 and installed for the first time - am very surprised to find that i) the ‘manual’ is very light indeed and ii) similarly for the online videos that the manual links to.
I find this in stark comparision to (say) the Nuendo & Wavelab manuals which allow one to study certain sections when required, or let’s say the significant DaVinci Resolve Studio manual which indeed provides so much information this can be overwhelming, but still, this supports targetted use for certain contexts, when needed. Ditto for video training. Resolve pricing is also about the same as for Spectralayers.
Given that Steinberg techncial support is amlost impossible to access in recent years (many posts about this elsewhere), the lack of professional documentation is IMO unnacceptable. Take ‘Unmix Stems’ as another example. Really? That’s the best Steinberg can do? - all music breaks down into ‘vocals, piano, bass, drums & other’? How should one understand to approch this manually and take far greater control than the so-called ‘AI’?
A better manual required, for sure.