The io is a full service Standard Definition digital and analog capture device for FInal Cut Pro. You can throw pretty much anything at it in terms of analog and digital, audio and video and ingest it in FCP. The io can also be used a standalone a/d/d/a for audio and video if you need such devices. You can monitor video (not audio) with After Effects and Motion. With FCP you can monitor both audio and video.
The Kona LH or LHe is an analog/digital, audio/video, Standard Definition/High Definition PCI-X or PCIe card. You can connect the outputs of your mackie mixer into the analog inputs of the card and digitize this into FCP.
When you use an a/d/d/a you usually use it to connect a digital device to analog device or vice versa. While the io and the KonaLH will in effect act as an a/d/d/a it’s not usually referred to as such. The are capture devices. As long as you are running FCP, you can throw all kinds of analog and digital signals at each of these devices, including S-Video. If you are using S-video with the LH you’ll need a Y/C to S-video adapter cable (it’s just a cable not a box with electronics in it).
Does this help?
Jeremy