Oberheim Xpander Owner's Manual

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111
a up
Random (typical)
Noise I typical I
Waveforms:
TRIANGLE:
This is the most common
LFO waveform,
a
smooth up and
down, perfect
for
conventional
vibrato
and tremolo.
UP
SAW:
The up
sawtooth
is useful for special
effects,
the sawtooth can
make
the pitch of
an
oscillator
go up
repeatedly,
or a VGA get loud.
DOWN
SAW:
The
down sawtooth
goes
in the
opposite
direction
from the upsaw
This is
useful for
echo
effects,
patched up to
one of the VCAs
on the
VCF/VCA page
SQUARE The
square
wave alternates
between
high
and
low. Good
for trills
RANDOM:
This waveform outputs a
random
signal.
Random achieves
the effects sometimes
called
sample
and hoid
(S/
H)
The random used
to
modulate the filter
frequency or oscillator
pulse
width
makes a
good rhythmic effect
when
triggered
externally (see
LFO
Page
2)
and
clocked by a
drum machine
or sequencer.
NOISE
Just
what it sounds
like, noise
A high speed
version
of random
This is good in
small
doses
for adding a
bit of
instability
to
oscillators,
or in
large amounts
tor buzzing
bees
SAMPLE:
The Xpander can
sample another source
and use that as
waveform.
The SPEED
controls
how often the source
is
sampled. The
SAMPLE control
appears to select
the sam-
pled source
which can be
any of the
Xpander's
modulation
sources
Sampling
this ujaue,
at this rate.
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Page 2
LAG
/
Each LFO has
its own
fixed-time lag
processor
Turning on
lag wrll smooth
out
any
sharp transitions,
like those
in
a
square or
sawtooth wave
(If
you
need
greater lag
control,
you can always
run the LFO
through
the separate Lag
Processor.)
RETRIG MODE
/
The LFO can
be
set to
restart
at a
programmable point
in its
cycle when-
ever a trigger
is received
This
control turns the retrig
function
on and
selects the
trigger
source: keyboard
(single
or multi trigger
modes) or the
External
Trigger
Input.
The
RETRIG
control
on Page 1 sets the
retrig point
Modulating
the LFO
The speed
can
be
modulated
by accessing its
Modulation Page
(press the
SPEED
button).
Recommended
modulation sources are the
keyboard so that the speed
changes
depending
on the note
played,
Velocity so that
the
speed
changes
depending upon
how hard
the note
is
played,
or one of the envelopes so
that
the speed
changes
as
the
note
plays. Of
course there
are
many other
interesting modulation
combinations,
like modulating
an LFO
with
itself,
so
that
it
changes
speed in the course of
its cycle
See
the Modulation
Page
Section for
more
info.
[YA Xpander Owners Manual
Creative
Input/The Xpardeo Vo CO

Oberheim Xpander Specifications

General

Type	Analog Synthesizer
Polyphony	6 voices
Oscillators	2 VCOs per voice
Control	MIDI
Synthesis Type	Analog Subtractive
VCA	1 per voice
Memory	100 patches
Modulation	Extensive modulation matrix
Year Released	1984
Filters	Multi-mode filter per voice
Envelopes	3 per voice
Keyboard	No keyboard
Inputs	CV/Gate
Outputs	Individual voice outputs