Hi George,
How exactly does the SAC interface with the console? I didn't see anything about hardware on the site so I'm confused as to how you're routing the FX to the console.
SAC is a mixer in the box. It's roots stem from RML Lab's SAW product that's been in studio use for decades though SAC is redesigned for a live performance workflow and performance. At it's core, it's a Windows based computer stripped down and tweaked for best real-time performance, studio interfaces and preamps of your choice to meet the needs or budget, and the SAC application ties it all together into a mixing console.
It is somewhat similar to the iLive system though all remotes (up to 28) are networked rather than running off a dedicated hardware connection. Several control surface options are available and the product continues to improve with each update.
FX are either SAW/SAC native plugins, DirectX, or VST plugins. Plugins must be zero latency adding. Every input, virtual aux/return and output channel has both pre and post fader patch points with the option to re-locate the input channel pre-fade patch points pre-EQ/Dynamics.