This may not be ready for prime time, but if anybody's interested, give it a read and tell me if it makes sense.
https://www.conradhoffman.com//Audacity SPL.htm
Thanks,
Conrad
https://www.conradhoffman.com//Audacity SPL.htm
Thanks,
Conrad
More ready for prime time and now includes a plug-in for Audacity that makes the task really easy.
http://www.conradhoffman.com/chsw.htm (6th item down on the page)
http://www.conradhoffman.com/chsw.htm (6th item down on the page)