I made the test strip printer described in Way Beyond Monochrome by Ralph Lambrecht and Chris Woodhouse. You can get the instructions here. It allows you to get up to 7 different exposures of the same area of the negative on one 5x7 sheet of paper. After selecting a base exposure for the highlights, you can repeat the test strip in 1/3 or 1/4 stop increments to select the level of contrast. You'll have to buy the book to get the specific instructions (ps. I don't get any royalties).