Hi handbone -
NI-Vision was designed for image analysis and processing to meet the needs of industrial and scientific imaging applications. In these applications, framegrabber boards and Firewire cameras are commonly used to acquire images and video. Because these devices do not capture audio, and because audio information is rarely needed in a machine vision application, audio capability is not a supported feature of the NI-Vision AVI functions.
I believe there are third-party tools available that provide A/V interleave functions, though. A quick search led me to the
Multimedia Toolkit, which is developed by
XOn Software. Kits like this may be able to fill your need.
David Staab, CLA
Staff Systems Engineer
National Instruments