That would be consistent with what I saw, which was that it appeared to do a curve with 0, 20, 40, 60, 80,100 positions.
I made a spreadsheet to do it manually.
Anyway, after some testing, it's pretty clear that this process is difficult for alternative process negatives because the prints are relatively low contrast. That seems to cause some trouble with getting consistent readings.
I'll work on some more things with this, but I may have to go back to the reflection densitometer to do this more accurately.
I'll post with some results once I have done a few more tests.
---Michael