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Apogee Electronics Corporation has just released an update to their Symphony PCI driver to include two new features, VBus and Performance Tuning.
VBus provides unlimited routing possibilities across multiple applications in any Symphony equipped G5 or Mac Pro. With VBus, users have the ability to create virtual hardware buses, which allows for the routing of audio within an audio application or between different audio applications. For example, it is now possible in Logic Pro to record a submix of multiple audio tracks onto a new audio track, which was previously impossible without VBus.
The Performance Tuning feature makes it possible to further reduce the latency of a Symphony system. When set to High Performance, latency is reduced to previously unattainable levels.
For more information see their web site.