But tastes can be different of course - if you want a sharpened preview pano, you could create one e.g. using the spheretocube tool. A custom striporder could be also created this way, output separate cube faces, rename them to numbered files and then merge them using the maketiles tool (could be automated with some batch/shell script).
Thanks for responding. I have a slightly different approach to this processing:
1. I optimize in this way some redundant tiles for the output files. Preview 3072x512 (approx. 300kb) / tiles 1024 / 2048 / 4096.
2. Horizontal Cube Strip is already both a 'preview' and the 'first' level (as it were).
3. Yes, I have to batch convert with a Pano2VR to get a Horizontal Cube Strip (with good quality) preview file, BUT wait, this is some kind of nonsense (!) ... using one authoring tool FOR another similar app.