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THRESHOLD, LOW CUT FREQ and HIGH CUT
FREQ controls, or when using other controls to modify
the input signal.
Using the External Signal Processor (ESP)
You can use the ESP to control the MS-20EX from an
external monophonic audio source, such as a melody
played on a guitar. Just like the original MS-20, the MS-
20EX will trigger its EGs and track the pitch of the
guitar–with varying degrees of accuracy. Of course, the
unpredictability is part of the charm...
Note that this will only work with single–note input,
such as melodies; polyphonic input will not work
properly.
You can also use the ESP as a modulation source when
processing audio signals through the MS-20EX. This
can be very useful with drums, for instance; you can
use the input signal to trigger EGs, use the ESP's
envelope follower to modulate the filters, and so on.
Important: the ESP only works if an MS-20EX note is
being played! You can use the Hold parameter, or a
damper pedal, to sustain a single note indefinitely if
desired.
To set up the ESP for external control:
1. If you are using a live input, connect the
instrument or microphone to the OASYS audio
inputs, and set up the gain accordingly.
2. On the EXi Audio Input page, select the desired
input.
For more information, see "4–2: EXi Audio Input" on
page 162 (Program mode), "2–6: EXi Audio Input" on
page 367 (Combination mode), and "2-6: EXi Audio
Input" on page 475 (Sequencer mode).
3. On the Patch Panel, connect the EXi AUDIO
INPUT to the SIGNAL IN.
4. Play a note on the keyboard, or via MIDI. Use
either the damper pedal or the HOLD parameter to
keep the note sustained.
The ESP is only active when a note is being played.
5. Increase the THRESHOLD while watching the
TRIG OUT light, until it lights when playing at
medium to high volumes.
The light shows when the signal is over the trigger
threshold.
6. Connect the ESP's TRIG OUT jack to the TRIG IN
jack.
This makes EG1 and EG2 respond to the ESP's trigger
output, instead of the keyboard.
7. Connect the ENV OUT jack to the VCA's INITIAL
GAIN jack.
This makes the VCA level follow the amplitude of the
ESP's signal, as generated by the envelope follower.
8. Connect the F∞V CV OUT jack to the VCO 1+2 CV
IN jack (or the VCO 2 CV IN jack).
This makes the pitch of the VCOs follow the pitch of
the ESP's signal.
9. In the BAND PASS FILTER, set the LOW CUT
FREQ to 10.00 and HIGH CUT FREQ to 0.00.
Program P6: Patch Panel
10.Play the highest note the ESP is to pick up, and
slowly increase the HIGH CUT until the desired
pitch is picked up.
11.Play the lowest note and slowly decrease the LOW
CUT until the note is picked up.
These measures help to refine the CV converter's
response to the input signal.
12.Set the CV ADJUST control so that the pitch
matches that of the input instrument.
The MS-20EX should now respond to the audio input,
as if you were playing on the keyboard.
6-1l: Parameter Details
The parameter details box shows different information
depending on whether the current selection is an input
or output jack, a knob, or one of the two assignable
mod sources (the wheel and switch).
Input and Output Jacks
If a jack is selected, this area shows the name of the
selected jack on the top line, and the jack(s) to which it
is connected on the bottom line, to the right of the
arrow. If nothing is connected to the jack, the bottom
line reads "(No Connection)."
If the selected jack is an output connected to multiple
inputs, only the first connection is shown, followed by
an ellipse.
Disconnect button
Pressing the Disconnect button clears all cables
connected to the jack.
Mod Wheel and Mod Switch
In addition to the functionality described under "Input
and Output Jacks," above, these jacks allow you to
select any AMS source, use Intensity to scale the signal,
and then route it into the patch panel.
Note that the Mod Switch can use any AMS source,
including continuous sources such as LFOs and EGs; it
is not limited to on/off switches.
6-1: Patch Panel
301
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