BiPort Manual 12.rsp - M-Audio

In order to route data between the application and specific ports on the
BiPort 2x4s, select (from within your application) the appropriate drivers
of the above list. Many newer applications (Cakewalk Pro Audio for
Windows, for example) will allow you to select and access all the BiPort
2x4s ports within the same session. Other applications will limit the
number of input and output drivers you may select at one time - for
instance, Master Tracks Pro 6.0 can only handle two MIDI ports at a
time.
SMPTE/MIDI Time Code Tutorial
This section gives a brief tutorial on various SMPTE topics. This section
is not by any stretch of the imagination an exhaustive treatment of time
code or syncing. Instead it is included to make the BiPort 2x4s SMPTE
functions more understandable.
What is SMPTE (Time Code)?
SMPTE is a time coding standard, which was developed in 1967 by the
Society of Motion Picture and Television Engineers (SMPTE) to be used
in video editing. SMPTE attaches a unique time stamp (80 bits of information)
to each frame of video or film. SMPTE readers may then extract
that time information and synchronize other devices to it. Because
SMPTE may be encoded as an actual audio signal, it also lends itself to
audio applications and can be read from audio tracks for synchronization
purposes.
The SMPTE Time Code consists simply of:
Hours : Minutes : Seconds : Frames.
Therefore a typical SMPTE time code reading would be:
01 : 25 : 42 : 17
which represents the time 1 hour : 25 minutes : 42 seconds : 17 frames.
The original SMPTE Time Code was Longitudinal Time Code (LTC).
“Longitudinal” means that the code is laid down in a continuous audio
stripe along the length of the tape (longitudinally). The BiPort 2x4s is
designed to write this longitudinal time code (LTC) as well as read and
convert it to MIDI Time Code (MTC).
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