r
*. 7IJJ
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Page 2
Pressing the PAGE
2
button selects sources for precise control of the filter frequency. They
are.
low
Pass
SWITCH MODE
fv.r
'.i
rr-
switch
mot
o
;*.jr •
o
OS
C*
o
o
-
t
i i . .
L
^"
j»
^f
^_^ ^r
^p
^_* ^F J^^&
Hiqh Pass
* i
E
1
U.
(»•
-i
*
4«
* * f *
•***
i i i
•
;
•
*
*
*
• *
* , 4 j , 4 i
\
. , <
i
i liji^
rf
r j
*
ft *
•
•ft
i
t
Band
Pass
Notch
-.**-
Phase
• *
V »
;
—
i
I
1
High
+
low
Notch
*
low
Phase
*
low
KEYBD
/
The
Keyboard pitch
LAG
/
The
Lag
Processor
for
portamento effects (see LAG).
LAG and KEYBD cannot
be
on
at
the same time
LEV 1
/
MIDI Lever 1. for pitch bend.
VIB
/
Vibrato
(see
Mutti Patch VIB
)
The Xpanded Fitter
Most synthesizers have only one filter mode. Some have two,
high
pass
and low
pass,
or like
the Oberhe*m OB-8
and
OB-Xa,
2
pole
and 4
pole
low pass. The Xpander
has 15 filter
modes, which
allows
a
wide range of tonal flexibility.
The filter
modes are
i,
2.
3,
and 4 pole
low
pass
1.2.3 pole high pass
2
and
4
pole band pass
2
pole notch (band reject)
3 pole
phase shift
2
and
3
pole high
pass
*
1 pole low
pass
2
pole notch
?
1 pole low
pass
3 pole phase shift
-
1 pole low
pass
Understanding these different modes is really quite simple.
The low pass modes filter out the high frequencies: that is, they let the
low frequencies
pass
through. The high
pass modes do just the
opposite; they
cut
off
the
low frequencies and let
the
high frequencies
pass
The
band
pass
modes
combine these two
functions;
they
filter
out the extreme
highs
and extreme lows, letting only
a
band
in the
middle
pass
through. The
notch,
or
band reject modes
do
the opposite of the band pass:
they let
through the extreme
highs & lows and filter
out
the middle. This
type
is called
a
notch because
it
cuts a
notch into
the
middle
of the
frequency spectrum. The last mode, phase, is unusual
because
it lets all
frequencies
pass
through.
But
it changes the phase
as
the sound
passes
through it. Chang-
ing
the
filter frequency shifts
the
phase. An LFO is especially good for this.
?fi
Xpander
Owners
Manual
Creative ^put/The
Xpanced
Voice
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