Another way of understanding the differences is a
bit of history.
In the 'old' days ( Auto
transformer boards and resistance dimmers ) each
dimmer has a big handle and was hard to move. Boards tended to have a smaller number of dimmers of larger wattages. If you have a board with ( say) 12 dimmers - you wrote your
cue sheets in terms of changes. If the
dimmer did not move in the
cue, you did not write it down. This basic method is what we now
call Tracking.
Then along came
SCR dimmers. ( late 60's or so). These let you have a little slider that was easy to control with just your finger instead of your entire
hand. And since we were talking about low
voltage components, we could
fade all of the dimmers by just reducing the
voltage to the little sliders. But wait - if I can do that I could have two sets of sliders ( A and B ) and
fade the
voltage between them. That way I could move all of the dimmers to a new
level at once. This is the
Preset way of thinking about the world.
The early computer consoles mimicked the
preset way of thinking ( since we were controlling
SCR dimmers and the
preset consoles were what those manufacturers were used to using ). With the original
Light Palette we got a board that would think in terms of
Tracking.
More recent lighting control software has mostly adapted the
tracking model. It is just more flexible and easy to use. ( Partly because they have added concepts like '
Blocking cues' to make
tracking friendlier. )