How are multiple outputs from BFD handled in Logic Audio?

When using Logic, the multiple outputs from BFD (like any other AudioUnit plugin) become available to special Audio objects called “Aux” channels. The primary stereo output of each plugin (Direct Stereo bus on BFD (Group Outputs) and Overhead bus on BFD (All Outputs)) appear at the original Audio Instrument channel used for BFD. If any of BFD’s outputs have not been directed to an Aux channel, then they will also appear mixed into the original BFD Audio Instrument channel.

You need to create a new Audio object in the “Audio” page of the environment and change the Cha parameter for the object to “Aux 1”. Repeat this procedure for the number of channels you’ll need for BFD (and perhaps more for other instruments if you require it) – BFD (Group Outputs) needs 3 stereo Aux channels (the first output is played through the original Audio Instrument channel used for BFD), while BFD (All Outputs) requires 2 stereo and 10 mono. If you use BFD in multichannel mode a lot, it’s a good idea to create these Aux channels in your Autoload.LSO so they’re already available when you start a new project.

To direct one of BFD’s multiple output channels to an Aux channel, click-hold on the input selector on the Aux channel (the 2nd selector above the fader) and select Instrument N (where N is the Audio Instrument channel containing BFD) -> Outputs 3-4, 5-6 etc. You will, of course, need to assign the Aux channel output to one of the Master channels, or a bus with an output to a Master channel, in order to hear these outputs.

Please note that Logic does not have automatic plugin delay compensation for Aux channels, so using any plugins which introduce a delay into the signal path, will lead to that channel being delayed.

Knowledge Base