Tracking is a console programming feature which means that only the changes are Recorded into a Cue.

Values that have not changed, do not get assigned a value.  You may have seen this called a "null" value before.

This is particularly useful where a Cue contains just small adjustments whilst the main "look" remains the same.

If a change is made to the main "look", each individual cue will not require updating as the changes will track through the cuelist.

ONYX by default only records the changes (Active Values). Sometimes you will want to record both Active and Inactive values into a cue - for example at the start of a new song, you can choose what values you record into a cue in the Record Options window which appears when you hit the Record button.