Thanks for chiming in guys, much appreciated.
wer, I did as you suggested; restored a library before analysis and "Updated tags from library". However the analysis tags still still show up in the library (on my iPad). I had assumed that command would fully update the tags but it must be that the any tags that were missing or incorrect will be placed or corrected, but tags that existed in the files will not be erased. So as an opposite tack, I replaced a music file on my hard drive with a file I know has no analysis and did an "update library from tags" and voila, the analysis tags are gone from that files library info. So it seems that to fully eliminate the analysis tags, I'd have to replace all my music files and that's not going to happen any time soon. Anyway, a great learning experience and I'll just live with it as is and just not invoke the DSP setting if I don't want audio levelling, etc.