Korg MS-20 Owner's Manual page 12

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High-Pass Filter + Lovv- Faaa Filter
qfevairaga Controlled Amplifier ivcais
This device varies the volume of sound passing through it in accord-
ance with the sum of control voltages from Envelope Generator 2
{E13 2i and from any external controller patched into the patch
panel VGA INITIHL GAIN iacit.
Envelope Generator 1 iEG-1l:
A special purpose Envelope Generator which is internally patched
to the M5-ED': 'v"l'.lD's and MVCAE llvioduiation 'v'i.'lAi control inputs
for pitch bends and delayed vibrato effects respectively. in addition,
both normal and reverse envelope outputs are available at the patch
panel for greater flexibility.
ii} Delay Time: Determines the amount of time between the arrival of
the trigger signal and the beginning of the attack cycle.
|[¢AttecltTime: Adjusts the time it takes for the Envelope voltage to-
go from zero to its peak level following the end of the delay time.
I1} Fleleese Time: Determines the arnou nt of time it takes for the
control rate to a level sat by the Sustain Level control, and eventual-
ly falls back to zero following termination of the trigger signal and
the end of the Hold Time at the Fielease Time control rate.
® Hold Time: Extends the trigger signal by a variable amount of time.
in effect, it "remembers" the trigger for a specified time period.
ii'-Attach Time: Sets the time the voltage takes to rise to a peak.
3 Decay Time: Sets the time the voltage takes to fell from the peak to
the Sustain Level.
93-sustain Laval: Sets the voltage level which will be sustained for the
duration of the trigger signal lplus time set by Hold controli
El; Releae Time: Sets the time the voltage takes to fall to zero follow-
ing termination of the trigger signal.
The EG-2' output is internally patched to the VCA so that changes in
volume over time will occur to sounds according to the EG-2 control
settings.
In addition, another EG-'2 output is sent to the Filter Modulation
controls iEG-2i'E)<Ti so as to modulate the VCF's cut-off frequency.
In this mode, the filtar's "steady state" is the Sustain Level. The
filter's cut-off frequency will start below this level initially, will rise
above the Sustain level during the Attack cycle, will fall to the Sus-
tain level, and then will fail below to the initial level again following
trigger release.
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Envelope Generator 2 iEG-2i:
This device generates a rising and falling voltage which when applied
to the VGA and 'v'CF produces corresponding changes in volume and
tone color respectively. The MS-20 features a unique 5 pert Envelope
Generator for ed-tied flexibility. When "triggered" lusually by de-
pressing a note on the keyboard}, the EG voltage rises to a peak at
a rate set by the Attack Time control, than falls at the Decay Time
B
@"l'l'lodulation Generator lfiilGi
This device generates a variable speed low frequency modulation
signal, and is also known as a Low Frequency Oscillator lLFDi. its
main purpose is to provide vibrato, trills, repetitive attack, and
other cyclical li.e..repaatingi types of modulations.
The MS-20 MG features two different simultaneous waveforms -
triangle and rectangle — both of whose shapes are continuously
variable by means of the Waveform control isee diagram].
The MG frequency is selected by the Frequency control, and is
displayed via a flashing red LED for easy visual confirmation.
Both waveforms are available via patch panel connection. in addi-
tion, the lviG's Triangle Wave is internally patched to the VCO': and
'v'CFs vie their respective MG Modulation Intensity controls. This
modulating signal is patched through the T. EXT jack on the patch
panel.
A different modulation signal le.g. Sample St Hold, "Delayed"
Vibrato, Wheel-controlled Vibrato, etc.) may be substituted at any
time and routed to all three MG intensity controls via this input jack.
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Control
Waveform .
Manual Controllers
Consists of two Controllers located to the left of the keyboard for
easy manipulation while playing.
E6' Programmable Control Wheel:
When connected to various control inputs, this highly useful device
can give such effects as pitch bends, modulation depth control,
filter "sweeping", sample and hold "arpeggios", and many more.
El}-filamentary Switch:
This switch is useful for triggering either or both MS-ED envelope
generators, or for triggering external devices,i.e.,another synthesizer
or sequencer.
® Patch Penal:
fir
in addition to the internal patching system discussed above, the
lvlS-20 Synthesizer features a versatile patch panel, which gives you
greatly expanded creative possibilities. The following is a listing of
the patch connections available.
VCO 1+2 CV lhl: This iack allows an external controller, such as
another Synthesizer. to vary the pitch levels of "v'CD-'i and 'L-'GD-2,
insteed of the MS-20's keyboard.
®vco 2 cv IN: Same as above, but affects vcoe only,
51' TRIG IN: Allows the use of external trigger sources la.g-.the MG
Rectangle output, footswitch, or another synthesizer or sequencerl
to trigger the MS-20 envelope generators.
@ EG-1 TFIIG IN: Same as ® above, but triggers Envelope Generator
1 only.
@ KBD CV OUT: Allows the M5-20 Keyboard to control the pitch of
another synthesizer.
'® KBD TFIIG OUT:
Whenever you play e key on the keyboard a trigger signal is gene-.
rated. Ordinarily, this trigger signal output is used along with the
I-(ED CV OUT to operate another synthesizer.
'E9 ext' steam. liil: This jack allows such extemai sound sources as
an electric quitar to be processed through the MS-20's 'v'CF and
VGA section. The external sound can be used alone, or combined
with the VCOE by using the VCD Mixer controls. In addition, when
using the ESP module, the original instru mant sound can be mixed in
with the synthesized sounds by using this iaclt.