d.
nulls and
1reaks
to sneep ttrrough
the
nnrsical
strnctrum
producing
'flangingn.
A
stronger, richer flange is reproduced
by
using
maximrm
feedback
to
create
a
chain of closely-sSnced
de1a1e
v*rose
uniform spacirg
strartrnns and strengthens ttre
corb
filter
peak
and nu11s.
Select
short
delays
such as I or 4
mS
and set
ttre FEDBACK near
the
maximum
setting,
either
trnsitive
or negative.
Fina1ly, npdulate
ttre
delay
by setting npdulator
WIum
at maxirmm and
Spnm
betueen
7:00
orclock
(for
a slow
flange)
and
12:00
orclock
(for
a fast
flange).
Iibte ttrat is is ingnrtant
to use near maxim.un feedback
so that
each
successive
recycled
delay
is
at nearly the sane
strengttr
as
its
predecessor,
yielding
the
strongest
reinforcerent/cancellation
pattern.
Itre flange can
be
varied,
of
course,
by selecting different
front
pnel
deIa1e. If
the
V{IUI}I
control
is set
less
than naximum, the
DEIAV FACTIOR can
be
used
to alter ttre delays
and thus
shift ttre
frequencies
of ttre
corb-
filter
Snttern.
Finally,
ttre flanged
signal must be mixed
with
the dry signal
via the delay mix
control.
FEDBACK
PTIASE II{\MSION
Ihe
feedback
phase
control
gives
you
ttre
oStion of
drixing
the
feedback
de1a1e
eittrer in
phase
(+)
or out of
trhase
(-)
with
the
incoming dry signals. Itris choice
alters
ttre
frequency
distribution
of
any
conb-filtering coloration
which
may occur as a
result
of
corbining
dry
and
delayed
signals.
You can
make
this
choice
by ear.
I'lhen
using
feedback,
sfurply
rotate
the feedback
control to
find out wtrether
lnsitive
or
negative
feedback
sounds
better in each
trnrticular
situation.
IUNED
RESOMI\rcB
Select rediurrlength
delays
(between
approxinately 2
and
32
milliseconds) to
produce
corb-filtering and ttren use maximun
feedback to create
a
string
of
closely spaced delays
wtrose
uniform
sSncing sharpens
and strengttrens the
peaks
and nuIIs
of the corb-
filter
lnttern.
As
a result, sore of the
trnaks
will
be
fed
back
at
alrpst
sufficient strengttr to cause
a
sustained
feedback
oscillation. Whenever the sletem is stfuullated
by
a
broadband
inprt
signal
such as
drums
or a strnaking
voice, it will
tend to
nrjng"
at
frequencies of
the corb-filter
trnak.
Since
the
peaks
in
a conb-filter
form a harmonic
series,
a
distinctly
musical
tonality
will
be
produced.
By varying ttre
delays,
the
pitch
of
ttre tuned
resonance
can
be tuned as desired. Inverting
the
plarity
of ttre
feedback will also alter
the
pitch
of the
resonance. For best
results,
ttre FEEDBACK control
will
normally
have to be
at a raximm setting.
A
principl
application
of tuned
resonance is the
processing
of
hunan
s5:eech
to
produce
"couquter
speech" by
adding
a fixedl>itch,
retallic resonance.
Such
resonances can also be used to color
various
percussive
sounds
in interesting
wale.
6
14
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