I'm finally getting some traction and having a lot of fun. I've read all the documentation I could find and watched all/most of the excellent videos by @d-healey. Clear, well-prepared and well-paced - great work, David!
I decided to experiment with an SFZ instrument (alto Sax). I imported it into the Sampler and all looked fine except that the note was only playing for the length of the sample and then cutting off. I looked in the Sample Editor and it appeared that the loop points hadn't been extracted from the .wav files.
So I renamed one of the .wav files with tokens and selected "Filename Token Parser" and it asked if I wanted to set the loop points from metadata and this time it worked fine.
So I thought, no problem, and wrote a utility to parse the SFZ and rename the .wav files with tokens. At which point I realised that the lokey and hikey did not appear to be part of the available properties. (Serves me right for not reading the documentation carefully - but did I read somewhere that the Importer is scriptable and perhaps I could map additional properties?).
Again, no problem, so I wrote another utility to parse the SFZ, extract the loop points from the .wav files and write out a SampleMap XML. Imported it and this time everything worked fine.
While it was an entertaining couple of hours of coding, it's occurred to me that some of the HISE users will not be programmers, so, (likely as a result of me being a novice at sampling), I'm probably going about things the wrong way.