Sierra users have been posting that in the BeatBuddy Manager (BBM) File menu, the Synchronize Project is grayed out. Apple and BBM developers are aware of the issue. Conventional user wisdom has been to just File > Export > Project to SD card and try to live with it. However, these users that are exporting the project to their SD cards also report losing foot switch settings, changes made to a song’s (tempo) on the pedal are not retained, along with other settings not being retained.
The workaround to the grayed out Synchronize Project menu issue is to restart your Mac, open the BBM and File > Export > Project to SD card (with your card in the computer). Depending on the number of folders, songs and drum kits, this could take a while. Once the export process completes, check your BBM menu. Is the Synchronize Project active or still grayed out? If still grayed out, quit, reopen the BBM and go thru the export process until the menu item is no longer grayed out (it takes me one to two times of exporting to “reactivate” the Synchronize Project menu entry).
This will continue to work as long as you don’t quit the BBM and/or restart your Mac. Yes, this workaround is a pain but probably slightly less so than restoring your settings one-by-one every time you export your project to the SD card.