The ADVC-55 is an analog to digital converter only, whereas the ADVC-110 can convert from analog to digital and digital to analog. This may be the reason why the ADVC-55 doesn't work as the ADVC-110 does in the workflow you've described.
Keep in mind that the ADVC devices are designed to transmit a generic, firewire-based DV stream for capture/recording into practically any video editing software for...well, capture and video editing.
Though you can jerry-rig some ADVC models to work as TV tuners, as it seems you're looking to do, this isn't their intended purpose--it's all a matter of using the right tool for the job. So don't set your expectations too high and expect the ADVC-55 to do something that it wasn't designed to do.
I believe
Elgato offers solutions for the Mac platform that will solve your problem.
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Chris Piscitelli
Grass Valley Sales (San Jose)
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