For telecine or upstream MegaDef changes there is no pulldown, so timing is straightforward.
Because of the 2:3 pulldown sequence generated when recording 24fps film to 30fps video, the colour corrector and noise reducer event timing setups become a little more complicated.
Once the film is converted to video, there will be pulldown in the frame sequence. The first item to adjust is the Field Number for the Secondary in the Room Setup window. Choose a section of film where individual frames can be recognized. Now mark a section of 1 frame events, at least four frames long. Using the Secondary, make recognizable changes to each frame of the section and record them to tape. After the edit has gone through, look carefully at the recorded section field by field. Check that the secondary changes match EXACTLY the film frames on the tape. If they are out of step with the film, alter the Secondary Field timing in the Room Setup window and re-do the edit. Keep altering the field timing number until there is a secondary colour change in each of the one film frame events. Once the correct sequence is established do not alter the field timing number. The Frame timing should now be adjusted to bring the corrections into the correct place on the film. Mark a few shots in a list in the normal way and make a large secondary correction to one event. Record this to tape and check that the correction happens in the correct place. If it is wrong, alter the Frame Timing number is the Room Setup window. Close the window to store these numbers to disk.
The noise reducer is timed in exactly the same way. Mark some single frame events in a list and make changes in the noise reducer on each frame. Record these to tape and carefully check that the sequence of the video matches the Film Frames. Alter the Field Timing number in the Room Setup to get this correct. When the sequence is correct, bring the changes into the correct place using the Frame Timing number. Again, close the Room Set-up window to store these values to disk.