Here is a link to a pre-release (beta) Build 306 patch that should fix the Audio Chord Wizard issue. It is still being tested currently, but you can install the previous build if you have any problems with it. You will find the previous build in the Band-in-a-Box/Data/Backup folder.
https://nn.pgmusic.com/pgfiles/support/patches/bb2019_mac_update_build306.pkg


Andrew
PG Music Inc.