Mackie MDR24/96 Operation Manual page 21

Use MMC On/Off to toggle MIDI Machine Control at the MDR24/96 MIDI Out.
Preroll is the amount of time by which
the transport location is offset when
jumping to a locate point. If Preroll is
other than zero, the transport will locate
to a point earlier than the locate time by
the amount of time set in the Preroll window. This is useful when you want the
locator to accurately define a point in the song (like when the guitar solo begins),
but when punching in at that point, you want to start rolling a few seconds before
hand. The MDR 24/96 allows you to set a Preroll amount and then toggle the
Preroll on or off as needed.
1. Press the SYNC button and
press the Right Arrow button
to move to page two of the
SYNC OPTIONS menu.
2. Press the Pre-Roll Time
select button.
3. Use the << and >> select buttons to select Hours, Minutes, Seconds,
or Frames and use the (–) DEC and (+) INC buttons to set the amount
for that field. Press the Zero select button to reset the Preroll amount
to zero.
4. Press the OK select button to return to the SYNC OPTIONS menu
when you are satisfied with the Preroll amount displayed.
When Preroll enable is on, Locate points are offset by the Preroll time. When
Preroll enable is off, there is no preroll offset.
1. Press the SYNC button and
press the Right Arrow button
to move to page two of the
SYNC OPTIONS menu.
2. Press the Pre-Roll On select
button.
3. Use the << and >> select buttons to turn Preroll on or off.
4. Press the OK select button to make your selection and to return to the
SYNC OPTIONS menu.