As one option try levels - drag the top left adjustment handle inwards to alter the shadows or type in an amount of your choice.
Nick, thanks for the tip. That works beautifully.
I am working hard to learn C1-5, so I will probably have a few more questions to ask the group. I am comparing it to Lightroom 3 Beta. Granted, LR is not a finished product, but I doubt that there will much change in the actual RAW conversions when the final version comes out.