I'm trying to get AUs within the Bidule FX AU to sync to the host tempo in Logic but they won't. I'm connecting the outputs to the plugin. This works ok in Ableton. Is there a different process in Logic?
It's not clear from your description if you're actually setting the loaded plug-ins to Sync To Bidule Plugin or not. Bidule Plugin is the sync source that simply forward sync information from the host.
If you look at the Bidule status bar, dsp is 0.00% this means that Logic is not currently processing Bidule. Volcano gets the Sync option on its first processing call. Is your Bidule instance on a mute/inactive track?