Okay... spent the past few hours reading and absorbing the manual. Sorry for the formatting and I'll try to insert breaks on this post later but this is relevent to anyone trying to load BFD Eco into Sonar...
Using BFD Eco as a VST plugin in Sonar Launching BFD Eco 1. With a project open, use the Insert menu to insert BFD Eco as a soft synth: Insert • Soft Synths • [VST plugins folder name] • BFD Eco 2. In the synth properties dialog box that appears, you can choose to set up BFD Eco’s additional outputs in the Sonar mixer. Unfortunately, this dialog box does not include an option to create all the required stereo and mono outputs, so it is recommended to choose ‘All Synth Audio Outputs: Stereo’, and afterwards manually change the stereo channels created for BFD Eco’s mono 1-16 outputs to mono channels. If you do not know how to do this, please consult your Sonar documentation or contact Cakewalk support. By default, all channels in BFD Eco are routed to the Master channel in the BFD Eco mixer, which is hard-wired to the first stereo output (output 1-2). In order to separate channels into discrete outputs, you must first route the relevant channels to the desired BFD Eco outputs in the BFD Eco mixer. If you need to use BFD Eco’s MIDI Out function, remember to check the ‘Enable MIDI Out’ checkbox in the synth properties dialog. 3. If the ‘MIDI Source’ checkbox was not left checked in the dialog box, you need to create a MIDI track and route its output to BFD Eco. If you encounter any problems performing the steps above, please consult your host’s documentation or contact the manufacturer’s tech support channels – BFD Eco operates in the same way as any other multiple-output instrument plugin. Recording BFD Eco’s output as audio To do this you either need to use Sonar’s mixdown functions – make sure you enable the Offline button before performing any offline or non-realtime export. It is also recommended to disable the ‘Use Fast Bounce’ setting in Sonar’s preferences. Alternatively, you can use BFD Eco’s audio export feature when exporting Grooves.