Martin smartMAC User Manual page 25

if you select tracking mode, speed is determined by the cross-fade time programmed on the controller. With
this method, the controller divides a movement into tiny steps that the fixture "tracks", or follows.
If you select vector mode, the fixture determines speed according to the DMX value you send on the speed
channel. Vector mode therefore allows you to control the speed of scene changes on controllers without
cross-faders. It can also give smoother movement, particularly at slow speeds, when using a controller that
sends slow or irregular tracking updates.
If the DMX controller has variable cross-fade times, set them to zero when using vector mode.
Personality overrides
Using the pan/tilt speed channel, you can set pan and tilt to tracking mode and at the same time set the
fixture's own pan/tilt speed setting to normal or fast from the DMX controller, overriding the pan/tilt speed
setting available in the fixture's control menus.
Using the effects speed channel, you can set the effects to tracking and at the same time set shortcuts to on
or off from the DMX controller, overriding the shortcuts setting available in the fixture's control menus.
DMX operation 25