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Ill
High-Pass Filter + Low —
@VoltageControlledAmplifier (VCA):
This device varies the volume of sound passingthrough it in accord-
ance with the sum of control voltages from Envelope Generator 2
(EG 2) and from any external controller
patched into the patch
panel VCA INITIAL
GAIN jack.
Envelope Generator 1 (EG•I):
A special purpose Envelope Generator which is internally patched
to the MS-20's VCOS and MVCA% (Modulation
for pitchbends anddelayed vibrato effectsrespectively. In "dition,
both normal and reverse envelope outputs are available at the patch
panel for greater flexibility.
@Delay Time: Determines the amount of time betweenthe arrivalOf
the trigger Signal and the beginning of the attack cycle.
@AttackTime:
Adjusts the time it takes for the Envelope voltage to
go from zero to its peak level following
the end of the delay time.
@Release Time: Determines the amount of time it takesfor the
voltage to drop to zero again following
the termination
signal.
Envelope Generator 2 (EGO):
This device generates a rising and falling voltage which when applied
to the VCA end VCF produces corresponding changes in volume and
tone color respectively. The MS-20 features a unique 5 part Envelope
Generator for added flexibility.
When "triggered"
pressing a note on the keyboard), the EG voltage rises to a peak at
a rate set by the Attack Time control, then falls at the Decay Time
6
control rate to a level set by the Sustain Level control. and eventual-
ly falls back to zero following
the end of the Hold Time at the Release Time control
@Hold Time: Extendsthe triggersignalby a variableamountof time.
CLF)
In effect, it "remembers"
OAttach Time: Setsthe time the voltagetakesto riseto a peak.
Decay Time:
Sets the time the voltage takes to fell from the peak to
the Sustain
Level.
*Sustain Level: Setsthe voltagelevelwhich will be sustained for the
duration of the trigger signal (plus time set by Hold control)
@Releze Time: Setsthe time the voltagetakesto fall to zerofollow.
ing termination
The EGOOutput isinternally patchedto the VCA sothat changes in
volume over time will occur to sounds according to the EGO control
settfngs.
In addition, another EGO output
CLF)
controls (EG.2/EXT) so as to modulate the VCF's cut.off frequency.
Filter
In this mode. the filter'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 fall below to the initial level again
trigger release.
VCA) control
inputs
EO—2
WT
PVT
ENVELOPE
Of the trigger
@ModulationGenerator(MG)
This device generates a variable speed low frequency modulation
signal, and is also known asa Low Frequency Oscillator (LFO). Its
main purpose is to provide vibrato, trills. repetitive attack, and
Other cyclicäl (i.e.,repeating)
The MS-20 MG features
triangle and rectangle — both of whose shapesare continuously
variable by means of the Waveform control
The MG frequency is selected by the Frequency control. and is
displayed via a fleshing red LED for easyvisual confirmation.
Both waveforms are available via patch panel connection.
tion, the MG'S Triangle Wave is internally patched to the VCO% and
VCF%via their respective MG Modulation Intensity controls. This
modulating signal is patched through the T. EXT jack on the patch
panel.
A different modulation signal (e.g. Sample & Hold, "Delayed"
(usually by de-
Vibrato. Wheel€ontrolled Vibrato. etc.) may be substituted at any
time and routed to all three MG intensiö,••controls via this input jack.
termination
Of the trigger signal and
rate.
the trigger for a specified time period.
of the trigger signal.
is sent to the Filter Modulation
ATTACK
DECAY
ÆLEASE
TIM
SUSTAIN
VEL
HOLD
types of modulations.
two different
simultaneous
waveforms
(see diagram).
In addi-
Triangle
Rectangle
yaveform
Manual
Controllers
Consists of two Controllers
located to the left Of the keyboard for
easy manipulation
while playing.
Programmable
Control
Wheel:
When connected to various control inputs, this highly useful device
can give such effects as pitch bends, modulation
filter "sweeping",
sample and hold "arpeggios", and many more.
Switch:
This switch is useful for triggering either or both MS-20 envelope
generators, or for triggering external
or sequencer.
a Patch Panel:
In addition to the internal patching systemdiscused above, the
MS-20 Synthesizer features a versatile patch panel, which givesyou
greatly expanded creative possibilities. The following is a listing of
the patch connections
available.
e VCO1+2CVIN: Thisjackallows anexternal c ontroller. S uch as
another Synthesizer.to vary the pitch levelsOf VCO•I and VCO-2,
instead of the MS.20's keyboard.
@VCO2 CVIN: Same asabove. b utaffects VCO•2 only.
TRIG IN: Allows the use of external trigger sources (e.g., the MG
Rectangle output. footswitch,
or another synthesizer or sequencer)
to trigger the MS-20 envelope generators.
@EG.I TRIG IN: Sarneas
above,but triggersEnvelope Generator
1 only.
—
@KBD CV OUT: Allows the MS-20Keyboardto control the pitch Of
another
synthesizer.
@KBD TRIG OUT:
Whenever you play a key on the keyboard
rated. Ordinarily.
this trigger signal output is used along with the
KBD CV OUT to operate another synthesizer.
EXT SIGNAL
IN: This jack allows such external sound sources as
an electric quitar to be processed through the MS-Ws VCF and
VCA section. The external sound can be used alone, or combined
with the VCO%by using the VCO Mixer controls. In addition, when
using the ESP module, the original instrument sound can be mixed in
With the synthesized sounds by using this jack.
depth control,
synthesizer
trigger signal is gene•.
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