Isaac,
The problem is that the DSR-45 isn’t adding set-up to the analog output. Io is expecting to see analog black as 7.5, so in effect you are capturing footage which is blacker than broadcast legal analog blacks. The digital DV signal doesn’t use a set-up and so blacks are at 0. Unless the video is “shifted” on output to fit into NTSC values, the video will be at 0 instead of 7.5.
When you look at the output of the Io on an NTSC scope the video has 7.5 set-up. Since no effects have been added, Io is allowing the illegal levels to pass. When you add an effect, the levels as clipped at the legal values, which means that these “crushed” blacks are flattened. The only way to avoid this is to: a) use a deck with “add set-up”, b) use a deck with an SDI card, c) use a third-party proc amp between the deck and the Io, or d) capture via FireWire.
Sincerely,
Oliver
Oliver Peters
Post-Production & Interactive Media
Orlando, FL
http://www.oliverpeters.com