Scooks hit the nail on the head.
Always load BFD2 from the synth rack and choose either, "all outputs to stereo" (or mono) Stereo will give you 7 stereo outputs ( 8 when you include the master) plus another 16 mono outputs. Loading all to mono will give you 32 mono outputs.
I would start simple first and unless you absolutely must use your own third party plug ins instead of the ones that come with BFD2 you could always just load a single stereo track by choosing, "first synth audio output"
I have some templates I made in order to help people understand BFD2's various routing options which can be found
Here Hopefully the link should work but let me know if it doesn't.
You can ignore the loop and effects I loaded, I was just messing around
Steve