Apogee’s VBus creates virtual hardware buses to allow expanded routing of audio within one application or between different audio applications. For example, it’s possible in Logic Pro to record a submix of multiple audio tracks onto a new audio track as described below. It’s also possible to route between two audio applications by selecting a VBus output in the source application and a VBus input in the destination application.
VBus is only available in the Symphony system. You must have either a Symphony 64 PCIe or Thunderbridge and at least one Symphony I/O, AD16x, DA16x, Rosetta 800, or Rosetta 200 to use it.
To use VBus: If you have a Symphony system and everything is connected and configured properly, launch 'Apogee Maestro 2' from your Applications folder and go to the 'System Setup' tab. Go to the right-side of the window and click the drop-down menu under 'VBus' to select how many channels of VBus i/o you would like to use. As soon as you engage VBus, quit all open applications and restart your Mac.
In order for VBus I/O to appear in your audio application’s I/O list as VBus In 1-2, 3-4, etc, it’s necessary to specify the use of the Symphony driver’s names in the application’s I/O list. For example in Logic Pro X, open MixI/O Labels and option-click on all the I/O found under the Driver’s I/O Label column.
As an example of how to use VBus, let’s record a submix of drums onto a new stereo audio track in Logic. In Logic’s Track Mixer, set the outputs of the individual drum audio tracks to VBout 1/2. Create two audio tracks (or one stereo track) and set their inputs to VBin 1 and VBin 2. Record-enable the new track and commence recording. The new track will record the mix of the individual drum tracks.