Just found a reference to Voxengo Span as a mastering aid on TDPRI Googled it and found it but a bunch of other free plugins for you to play with, available for MAC & PC in 32 & 64 bit variations VST3 + AAX where required http://www.voxengo.com/group/free-vst-plugin-download/
Regards Dave King https://nevertoolate2.bandcamp.com/
I've got several of those and they are pretty good tools.
Build #1 ES-3 Build #2 EX-1 Build #3 Customised ES-1 in an ES-330 style Build #4 & #5 GSJ-1 and GSM-1 Build #6 GST-1 Build #7 Harley Benton JB Build#8 ES-1
Forum Rules