Forget about the switcher.

Forget about the switcher. I use 2 HD7’s for a lot of live events. Just use a clapper board, or electronic flash at the beginning and keep the cameras running.

Use the multicam setup in Vegas or FCP to do the cuts and fades after. Put the tracks/clips on the timeline and adjust to the audio waveform to synchronize.

In Vegas I can display each camera in the preview window and switch between them as I watch the playback. I’m pretty sure you can do the same in FCP.