Your
final
mixed
audio
on
a
single
Mag-track
reel
must
be
converted
into
an
optical
track.
An
optical
track
is
a
roll
of
film
(a
negative)
that
is
as
long
as
your
entire
movie
with
a
narrow
pattern
on
one
edge
of
the
film
-
opposite
the
perfs
(in
single
perf)
16mm
and
between
the
image
area
and
the
perfs
in
35mm.
Light
intermittently
passes
through
this
pattern,
generating
the
analog
signals
that
are
converted
back
to
an
audio
signal
by
the
amplifier
in
the
projector.
Since
your
original
camera
negative
is
a
B
wind,
make
sure
your
optical
track
is
a
B-wind
too.
This
optical
track
will
be
composited
by
the
lab
onto
your
answer
or
composite
print
and
your
final
composited
inter-negative,
from
which,
all
of
your
distribution
prints
will
then
have
sync
optical
audio
right
on
the
print
itself.
