--
flanging as
an
example.
But
it
can
also
be
used
with a function generator
providing square waves, ramps, or other functions
for
additional
latitude
in
creating
special
effects.
A square
wave,
for example,
can
provide several
distinct
and
different
resonance tones
when
used
with a resonance
effect.
3.8
TWO
M.93'S
The
subject
of
the
two
M.93's
is
perhaps deserving
of
a chapter
all
its
own.
For
two
not only double the capacity
of
one, they also give
rise
to
new
~apaîš
bilities
altogether.
Flanging, for instance,
can
have
a
virtually
infinite
sweep.
Reverberation techniques
can
utilize
far
more
complex
interconnec-
tions.
Of
course
more
straightforward
applications
can
be
enhanced:
triple
tracking can
go
to quintuple tracking;
two
slap echoes
go
to four slap echoes;
mono
effects
go
to
stereo
effects;
stereo
goes
to quad,
etc.
Flanging with a
single
M.93
spans a frequency range
of
2:1 corresponding to a
maximum
delay
difference
change
of
2:1 using the
VCO.
But
with
two
M.93's
the frequency range
can
be
arbitrarily
large.
For
example
set
one
delay tap
of
M.93A
to
10
msec
with the
VCO
in the
11
(cal)
11
position.
Feed
the single
delayed output to the
AUX
input
of
M.93B.
Use
the
same
source for the
IN
input
of
both
units.
Set
one
of
M.93B's
delay taps to
10
msec
as well. This
time use the
VCO
of
M.93B
to vary
its
delay time
from
10
to 5
msec
and
mix
the corresponding delay tap with
AUX
at
identical
levels
in the
OUTPUT
MIX.
At
one
extreme the time
difference
of the
two
delays
is
5
msec.
At
the other
extreme the time
difference
is
0.
The
range
of
delay differences
is,
then,
5:0.
The
notch
of
a
positive
flange will vary in frequency
from
200Hz
(cor-
responding to 5
msec)
to
an
infinitely
large
frequency (corresponding to 0
msec).
To
lower the bottom frequency
even
more,
increase the delay time in
both
units.
To
limit
the highest frequency notch reduce the delay time in
M.93B
alone.
Reducing
the
DEPTH
will increase the lowest frequency
of
the
flange.
Reducing
the
DEPTH
control will decrease the highest frequency
of
the flange
if
M.93B
is
set
to
20
msec
delay instead
of
10.
Simulated reverberation with the
two
M.93's
can
be
made
to
have
much
higher
echo
densities
by
recirculating
four delay taps instead
of
only the
two
available
with
one
M.93.
Several approaches
can
be
taken in order to ac-
complish
this.
Use
one
M.93
to provide
two
additional delay times
which
35
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