..
2q
To
overlay the repeating segment with
new
source material bring
up
IN
and
AUX
inputs
at
the
OUTPUT
MIX,
or
select
0 delay
which
will send the
INPUT
MIX
signal
to
the
respective
delay tap.
Use
the 0 delay
setting
to
recirc-
ulate
and
bandwidth
limit
the input through the
ROLLOFF
and
DELAY
MULTIPLY
functions.
See
section
3.4
for
an
explanation
of
the
ROLLOFF
and
RECIRCULATE
functions. This allows
some
flexibility
in
creating
the output
mix
even
though the
new
input material cannot
be
delayed.
3.4
RECIRCULATION,
ROLLOFF,
PHASE
See
FIG.
3. 5
At
this
point
virtually
all
of
the functions
of
M.93
have
been
covered
and
with
them
corresponding delay
effects.
But, with the exception
of
REPEAT
HOLD,
none
of
these
effects
have
been
sustained.
The
delayed
effects
lasted
2.048 seconds
at
most. This section will cover sustained
effects
--
more
natural sounding reverberation
and
echoing
and
bizarre
feedback resonance
effects.
It
will
also
cover a
few
fine
points
and
variations
of
already
familiar
effects.
ECHO
Set
up
an
echo
effect
as described in section 3.1 with delays A
and
B
set
to
97
and
128
msec
respectively,
DELAY
MULTIPLY
at
4X,
and
an
OUTPUT
MIX
of
IN,
A
and
B in order
of
descending
levels.
The
result
is
the source with
two
"slap
11
echoes.
But
now
bring
up
A
and
B in the
INPUT
MIXER
(not
so
far
as to cause
limit)
to hear
recirculated
delays increasing in
number
(echo
density)
until
they
die
away.
The
ROLLOFF
controls determine the bandwidths
of
the
recirculating
delays. Decreasing the
ROLLOFF
frequency corresponds
to high frequency absorption
from
reflecting
surfaces
and
through
air
--
sim-
ilar
to the bandwidth
limitations
of
the
DELAY
MULTIPLY
function, but
at
a
gentler
6dB/octave slope.
REVERBERATION
In
a
similar
manner
the
RECIRCULATE
and
ROLLOFF
functions enable the simula-
tion
of
reverberation
at
lower delay
settings.
Reduce
the delay times
by
de-
creasing the
DELAY
MULTIPLY
factor
from
4X
to
2X
and
to
lX
noticing
that
the
apparent
room
size
decreases correspondingly.
Significant
amounts
of
recirc-
ulation
at
relatively
small delay times will display
some
unnatural side
effects,
particularly
if
the delay times contain
common
numerical
factors.
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