MOTU micro express-USB, User Manual

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U S I N G M I D I E X P R E S S X T C O N S O L E
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This slider lets you control how many frames in a
row the MIDI Express XT needs to receive to
consider incoming SMPTE as being parked on a
single frame. While lowering this value makes the
MIDI Express XT more responsive when you park
on a frame with your video deck, it is also more
likely to misinterpret ordinary transport shuttling.
So make this value as low as you can, but raise it if
you start getting improper frame locations when
shuttling your deck.
Offset/start time
Start time is the SMPTE frame at which you would
like to begin striping time code. You can type in the
desired time here. Notice also that there are two
buttons to the right of the offset for starting and
stopping striping. For details about striping, see
“Striping SMPTE” on page 73.
The Sync window displays an offset time when the
master source mode is MIDI Time Code , LTC
(SMPTE) , or LTC QuikLock modes in which tape
striping is not possible. You can only start striping
when the master source is set to
Internal .
Take care when using Offset/start time
The LTC start setting in the MIDI Express XT
serves as the start frame when striping, but also as
the offset when reading. If you stripe at 1 hour
(1:00:00/00) and then lock to the time code you
just striped — without readjusting the star/offset
setting back to 0:00:00/00, then the Express XT
converts starting at 2 hours (2:00:00/00).
Transport buttons (Internal mode only)
These buttons make the MIDI Express XT start
and stop generating time code (both MTC and
LTC) when the unit is in Internal mode. When you
click the green triangle, time code will begin at the
frame entered in the
Start time field.
LTC output
These options control the SMPTE time code (LTC)
output from the SMTPE jack on the rear panel of
the MIDI Express XT. The frame Format options
(24, 25, 29.97, 30, and drop) determine the frame
rate that will be generated. These option are grayed
if any master mode other than Internal is chosen.
This is because in all other cases, the MIDI
Express XT is merely reading and matching the
timecode being received from an external source.
The Signal Level options let you adjust the volume
of the SMPTE output from the MIDI Express XT. It
is grayed in LTC QuikLock mode.
The “Continuous Signal” option applies to
situations in which you are feeding time code
(most likely LTC) to the MIDI Express XT, and the
time code continues even when its source is parked
on a frame. For example, you might be using a
VITC-to-LTC converter that continuously sends
time code when video is paused. In this situation,
you can enable the
Continuous signal option to
make the MIDI Express XT continue to output
time code (both LTC and MTC) as well. This
option is grayed in Internal sync mode.
Sync routing
The Sync source (which is basically any MTC
converted or generated by the MIDI Express XT)
can be routed to any destination port (see “MIDI
routing” on page 56). This can be useful if you
encounter cases where need to transmit MTC to
some other destination besides the computer
connected to the MIDI Express XT. For example,
you may want to synchronize a drum machine or
another computer to the same SMPTE signal. In
this case, you would just connect a “MIDI OUT” of
the MIDI Express XT to the “MIDI IN” of the
destination device and route Sync to the
appropriate destination port the MIDI Routing
window as shown in Figure 7-11 on page 59.
!USB Interfaces Manual Book Page 63 Tuesday, October 10, 2000 12:43 PM