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L
OCKING TO
A common application in the audio post-production environment is locking to
video using the timecode on the video tape as a source. This requires a
synchronizer interface, such as the Alesis AI-2 or BRC. The connections consist
of running a balanced 1/4" TRS cable between the AI-2's [SMPTE IN] connector
and the VTR's SMPTE OUT (if timecode is recorded onto either the left or right
audio track of the tape, connect the cable to the proper channel's output
connector) and a BNC connector from the house sync being provided to the VTR
(such as a black-burst generator), or the VTR's video out to the AI-2 [VIDEO
IN]. The AI-2's [SYNC OUT] to the XT20's [SYNC IN] connector.
When the XT20 detects an on-line AI-2 or BRC, it will ID itself as a slave (ID
1) and the Clock will automatically switch to External (the EXT icon will
light in the CLOCK icon group). Refer to your AI-2 or BRC Reference Manual
for more information.
C
OMPUTER
MIDI S
MIDI M
C
ONTROL
ADAT-XT20 Reference Manual
V
IDEO
C
ONTROL
: V
YSTEMS
Lately, many sequencing software manufacturers have been integrating
digital audio hard disk recording and playback into their sequencers.
However, the XT20 can offer much of the same flexibility without the
added expense of a new program (or upgrade) or the hardware that
accompanies a hard disk recording system. This requires a timecode
interface, such as Steinberg's ACI or JLCooper's DataSync 2, which will
convert the XT20's timecode (which is recorded when a tape is
formatted) into MIDI Timecode (MTC) which a sequencer can
synchronize to.
Connect the [SYNC OUT] from the XT20 (or from the last slave in a
multiple ADAT system) to the [SYNC IN] of the timecode interface you
are using. Connect the timecode interface's [MIDI OUT] to the [MIDI
IN] of you sequencer. Set your sequencer to synchronize to the MTC being
received from the timecode interface. As you control the XT20's tape
motion with the transport controls, the sequencer will automatically
follow along, letting you mix digital recordings with virtual MIDI
tracks on a MIDI sequencer.
C
ACHINE
ONTROL
Many of the computer-based sequencing software programs today have
implemented MIDI Machine Control (MMC) into their sequencers. MMC
is a specification implemented by the MIDI Manufacturers Association
(MMA) and the Japan MIDI Standards Committee (JMSC) which
details a set of messages that provide a universal way of having
sequencers and tape machines speak to one another (not to mention tape
machines talking to each other). These messages include: basic
transport functions (like Play, Stop and Record), Locate functions (go to
a specific tape location), Track functions (record-enable, input monitor,
track delay), and many other types of messages. However, not all
sequencers send out all these messages; some even send only basic
: C
-O
ODE
NLY
T
IRTUAL
RACKING
: V
IRTUAL
Applications: Chapter 6
M
ASTER
R
EMOTE
107
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