Cherry Surreal MG-1 Plus User manual

Surreal MG-1 Plus

Cherry Audio: Surreal MG-1 Plus User Manual
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1Getting Started
The Surrealistic MG-1 Plus is a loving recreation of an oddball collaboration between Moog
Music and '70s/'80s consumer electronics giant, Radio Shack. The story goes that Radio
Shack's marketing believed they could sell a synthesizer to budding musicians and hifi
enthusiasts, leading to an OEM deal with Moog and resulting in the Realistic Concertmate
MG-1. These sold for $500, and depending on your perspective, this was either crazy cheap
for a geniune Moog synth with a real ladder filter, or really expensive for a Radio Shack item.
Radio Shack association not withstanding, the MG-1 was a great sounding little synth with a
few dumb limitations, all of which have been addressed with Cherry Audio's Surrealistic MG-
1 Plus. These limitations included a limited range two-and-a-half octave keyboard (MG-1
Plus responds to any keyboard range), limited octave switching (MG-1 Plus adds a three-
position transpose switch), and very limited square-wave only polyphony section (MG-1 Plus
adds a sawtooth, mod abilities, and a range switch). We'll get into the specifics in each
section of this manual, but suffice to say, MG-1 Plus builds upon the original easy-to-use,
great sounding MG-1, and adds to the fun with convenient, modern features.
1.1.1 Manual Layout
This manual will detail each section of MG-1; the order of the chapters follows the signal
flow (as opposed to the physical layout of the front panel sections).
1.1.2 Technical Assistance
Cherry Audio's unique online store and automatic updating should make operation a
smooth experience, but if you run into any issues or have questions, you can discuss issues
online at the Cherry Audio forums at:
https://forums.cherryaudio.com/
... or you can communicate directly with one of our surly and grumpy, scratch that...
outgoing and friendly tech support staff at:
https://cherryaudio.kayako.com/

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2Top Toolbar and Preset Browser
The purple strip at the top of the MG-1 Plus interface is where you’ll load, save, and create
sound presets. It contains utility functions such as undo/redo, UI zoom and Focus controls,
under-the-hood settings, and more. Let’s go over them:
New- Opens a new blank patch preset. If an unsaved patch is currently open or you’ve
modified an existing saved patch, a dialog asks if you’d like to save the patch in its current
state. This greatly reduces the possibility of losing an edited unsaved patch.
Save- Use this to save patches. There are a couple of levels of hierarchy:
Collection- This is the top level of organization, and contains entire “sets” of presets.
The MG-1 Plus Presets are the main included collection. We also include a User
Presets Collection for storing your own presets, but you’re free to create your own
collections. To create a new collections, click in the Collection text field (where it says
User Presets above) and type a name. User-created sounds can be freely saved to
any collection; we like to keep ‘em separated for organizational purposes.
Categories- Within each Collection are a number of sound categories. As with
collections, you’re free to create as many categories as you like. To create a
category, click in the Category text field of the Save dialog window and type a new
category name.
Patch- A patch is an individual sound. To save a patch, simply type the name in the
Name field and click Save.
Keywords- You can add descriptive words such as “huge,” “noisy,” “poly,” etc., to
patches to make them appear when terms are typed in the Search field. Use commas
to separate multiple keywords entries.

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Browsing Patches- Patches can be browsed by clicking the <Select Preset> field. To select a
preset collection, click in the area that says <All Collections> or on the downward-facing
arrow next to it.
Clicking on the left-side categories narrows down which patches are displayed.
<All Presets> will show presets from all collections and categories.
<Recent> displays recently used presets.
Refresh- This is the circular arrow button to the right of the downward arrow;
clicking this checks the Cherry Audio server for new or updated presets.
Pin- Clicking the push-pin icon locks the patch selection list open, allowing fast and easy
browsing and auditioning of patches. Click the icon again to disable pin mode. when in pin
mode, the up and down arrow keys can be used to select patches.
Preset- Step Back/Forward Arrows- These step to the previous or next preset.
Undo/Redo- These circular arrows will undo or redo the last action. It remembers many
steps, so if you really loused something up, keep on clickin'...
Settings- This is where user preferences for user interface, audio interfaces, user account,
and more are configured. See the Settings section for full information.
Zoom Magnifying Glass- Click to resize the MG-1 Plus interface.
Selecting 100% returns the user interface to native size.

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MIDI Tab- Opens the MIDI controllers tab for configuring internal and hardware MIDI
controls. See the MIDI Controllers Setup and MIDI Tab section for full information.
! (MIDI Panic) - Click to send an all-notes-off message in case of, "why won't this thing stop
making noise?!?" stuck-note incidents.
Tempo (Standalone Version Only)- Displays MG-1 Plus’s current internal tempo setting.
MG-1 Plus's internal tempo affects the LFO, Arpeggio, and Delay sections when their
corresponding Sync buttons are toggled. The tempo setting can be changed by moving the
mouse up and down anywhere in the tempo section, or by double-clicking the number and
entering the desired BPM value.
The tempo display only appears in the standalone version of MG-1 Plus. VST, AU, and AAX
plug-in versions receive tempo data from their host DAW app.
QWERTY Musical Typing Keyboard- Opens an onscreen keyboard allowing
a standard QWERTY computer keyboard to be used for playing music
notes. For more information, see QWERTY Musical Typing Keyboard
(MTK) section.
Help - Clicking this launches your web browser and opens the help
document you’re currently reading. Which means you're already here...
Surrealistic MG-1 Plus (left side) and Synthesizer by Cherry Audio (right side) logos-
Clicking either of these displays “about” information, and shows the version number and
current registered user ID.
2.1 Focus Button
If you're using a wee laptop, the user interface can potentially be hard to
see. With this in mind, the Focus button conveniently blows up MG-1's
view to roughly twice its normal size within the current window size.
Unlike the Zoom "magnifying glass" function, Focus doesn't affect the current window size.
By default, the patch panel section fills the current window, but the view can be scrolled
vertically and horizontally with a mouse wheel, track pad, or Apple Mighty Mouse finger-
scrolling. Or if you're the last person on earth still using a single-button mouse, scroll bars
will appear at the window edges when in Focus mode.
Using Focus mode couldn't be easier - just click the Focus button the top menu bar. To
return to standard view, click Reset. There's also a superfast key shortcut - on Mac, hold the

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⌘[COMMAND] key and click the mouse; in Windows, hold the [OPTION] key and click the
mouse. Focus can be reset with the same key shortcuts.
2.2 Preset List Right-Click Functions
Show File-This displays the
selected preset in the Mac or
Windows folder containing it. This
is useful for backing up or sending a
preset file to another user.
Show In Original Category- Selects
the preset within its category, i.e.
the category will highlight in the
left preset menu. The Show In
Original Category command only displays if the preset was selected within the <All Presets>,
<Favorites>, or <Recent> categories.
Favorites- Favorited presets will show in when the <Favorites> category is selected. A star
will display next to the preset name. Right-click on the preset and reselect Favorite to un-
favorite it.
Delete- Deletes the selected preset.
Restore Factory Preset- If one of the factory (i.e. not user) patches is edited and saved,
selecting this command restores the patch to its unaltered "factory" setting. This menu will
be grayed-out for user bank patches.
Restore All Factory Presets From 'MG-1 Plus Presets'- If any patches from the "factory" MG-
1 Plus bank are edited and saved, selecting this command restores all of them to their
unaltered "factory" setting.
Restore All From Factory- If any patches from the "factory" banks are edited and saved,
selecting this command restores all of them to their unaltered "factory" setting. At the time
of writing, the MG-1 Plus bank mentioned above is the only factory bank, so this function
and the Restore All Factory Presets From 'MG-1 Plus Presets' above have the same effect.

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3Tone Sources Section
As monophonic analog synths go, MG-1 Plus
is unique in that if features two standard
mono analog oscillators (i.e., capable of
sounding one note at a time), as well as a
poly section that can sound up to 32 notes
simultaneously. In this section, we'll discuss
the mono oscillators. Note that the MG-1
front panel refers to oscillators as "tone
sources;" perhaps Radio Shack felt this
would be less intimidating for consumers
than, "oscillator."
Sync 2>1- This causes Tone Source One to
force reset the start of Tone Source Two's
waveform to the beginning of its cycle,
resulting in a wide range of harmonic tones
from Tone Source Two. The range of tones
can be varied by adjusting Tone Source
Two's Detune and Octave controls.
Octave- Sets the pitch range for each oscillator in octaves.
Fine Tune (Tone Source Two only)- This can be used to fatten up two oscillator patches by
detuning a small amount, or for "building-in" a set interval. Its range is a smidge over a fifth,
up or down (unless the Sync 2>1 switch is on).
Wave Shape- These allow selection of sawtooth, square (Tone Source One), or pulse (Tone
Source Two) waves.
3.1 Master Tuning and Note Priority/Trigger Controls
Tone Sources- The knob at the top left of the panel acts as a master
tuning control for both Tone Sources, with a range of just over +/- 300
cents.

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Note Priority- Since the Tone Generators are monophonic (i.e. they can
only play one note at a time), this control determines which note will
sound if more then one key is played simultaneously.
Last- This is the default voice mode. If more than one key is
pressed, the most recently struck note will always take priority.
High- If more than key is pressed, the highest note will always
sound.This how the original Realistic MG-1. Interestingly, this the
opposite of how most vintage monophonic synths work - most
are low-note priority.
Low- If more than key is pressed, the lowest note will always
sound.
Trigger Mode- Determines Contour Generator triggering behavior. In Retrig position, the
Contour Generator will retrigger any time a new note is played; in Legato position,
retriggering only occurs if no other keys are currently held down - this is how most vintage
monophonic analog synthesizers operate. Generally speaking Retrig mode will have a more
modern and responsive feel, and is good for insistent bass lines or percussive sounds.
Conversely, legato is useful for singing leads where you'd only want to hear the attack
portion of a sound when the first note is played - a good analogy would be plucking a guitar
string a single time, then sliding the fretting finger around to change pitches.
Master Transpose- Due to the limited range of the original instrument, we've added a
three-position transpose switch at the left of the keyboard. This affects both Tone Sources,
as well as the Poly section.

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4Poly Section
The original MG-1 included a rudimentary poly section that operated
independently of the Tone Sources. The good news is that it allowed
chords to be played on an otherwise mono (one-note-at-a-time) synth. The
bad news is that it was extremely limited - its only control was a single
level slider in the mixer section. It could only produce a square wave, its
octave range was fixed, and its pitch could not be modulated. As you might
guess, this made for a pretty blah poly synth experience.
With that in mind, we expanded the Poly section's capabilities considerably with a few
additions. We added a saw wave, a three-position range selector, and a modulation amount
slider in the Modulation section. This may not seem like a much, but trust us, these simple
additions make a huge difference in the Poly section's usability.
Note that the Poly section can sound a maximum of 32 simultaneous notes.
Octave- Sets the basic pitch range of the Poly section. Note that the Master Transpose
switch at the left of the keyboard also affects the Poly section range.
Wave Shape- Allows selection of sawtooth or square wave.
4.1 Master Tuning Control
Polyphony- The second knob over at the top left of the panel acts as a
master tuning control for the Poly section with a range of just over +/-
300 cents. This is also useful for subtle chorusing/detuning of the Poly
section against the Tone Sources.

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5Filter Section
The Filter section is a 24 db/oct lowpass
filter that removes high frequencies as its
cutoff frequency setting is decreased from
max, resulting in a dulling of sound. This a
version of the classic transistor "ladder"
filter, famously heard in the Moog
Minimoog synthesizer, and renowned for its
meaty, fat sound.
Keyboard Tracking- This causes the cutoff frequency to increase as ascending notes are
played on a keyboard. The idea behind this is, because actual note frequencies rise as higher
pitches are played, the Kybd slider adds a rising CV to the cutoff frequency in order to
maintain the brightness of notes as higher pitches are played.
Out- Cutoff frequency stays constant across the keyboard - i.e. no tracking.
1/2-Cutoff frequency tracks at half the keyboard CV voltage - i.e. the cutoff
frequency rises one octave for each two octaves played on the keyboard.
Full-Cutoff frequency tracks the same as the keyboard CV voltage - i.e. the cutoff
frequency rises one octave for each octave played on the keyboard.
Cutoff Freq- Sets the frequency where high-frequency attenuation begins, from 20 Hz up to
24,000 Hz. Though it seems odd to have a cutoff control that goes 4000 Hz above human
hearing threshold, remember that all filters have a "slope" to their response, so that extra
range guarantees you won't hear any filtering at maximum setting.
Peak Emph- The "emph" is short of for emphasis, commonly referred to as resonance. This
emphasizes sound energy at and around the current cutoff frequency by adding feedback
from the filter's output back to its input. At lower settings, this can be used to create mild
resonances such as those heard in acoustic instruments. MG-1 Plus’ implementation is fully
self-oscillating - at extreme settings, it can be used as a sine wave generator, but be careful
because high resonance settings can result in loud, screamy, dog-terrifying (and speaker
blowing) occurrences.
Contoured Cutoff- The Contoured Cutoff slider applies Contour envelope (i.e. envelope
generator) modulation to the cutoff frequency. This allows familiar auto filter sweeps. When
raising the Contoured Cutoff control, you'll generally want to lower the Cutoff Freq control,
as these work in conjunction with one another.

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6Contour Section
The envelope generator section is an
envelope generator used to dynamically
shape volume and and/or cutoff frequency. If
you're not familiar with the operation of
envelope generators, here's an overview:
When MG-1 Plus sees a gate voltage from a note, the contour generator outputs a
dynamically changing voltage, according to the settings of its stages. The Rise Time (i.e.
attack) stage defines how long it takes for the output voltage to rise from 0 to 5 volts. Once
the Rise Time reaches 5V, it moves to the Sustain phase if the Sustain switch is set to the In
position and the holds at 5V until the key is released. If the Sustain switch is set to Out, it
immediately moves to the Fall Time stage. The Fall Time (i.e. decay and release) slider
defines the the length of time it takes for the voltage to fall back to 0V when the gate input
voltage is removed, i.e. when the key is released.
Rise Time slider- Defines the length of time for voltage to rise from 0V to 5V when a key is
played.
Sustain- When set to the Out position, following the Rise stage, the contour generator
immediately moves to the Fall stage. When set to the In position, the envelope holds at 5V
until as long as a key is held. When the key is released, it moves to the Fall stage.
Fall Time slider- Defines the length of time for voltage to fall from full sustain level to 0V
when a key is released.

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Tone Sources mode- This defines the behavior of the internal voltage-controlled amplifier,
which acts as something of an automatic volume control and on/off switch for the final
sound.
Contoured- Rise Time, Sustain, and Fall Time parameters are applied to amplitude.
Keyed-Rise Time, Sustain, and Fall Time parameters have no effect on amplitude -
notes play in simple on/off fashion. This is useful when using using the Contour
section for controlling filter envelope sweeps via the Filter Contoured Cutoff slider.
Continuous-Notes sound continuously. This is useful for drones and exceptionally
lazy keyboardists.

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7Modulation Section
The MG-1 Plus includes a low-frequency oscillator (LFO) that generates sub-audio range
signals intended for modulation purposes.
Wave Shape- Selects the repeating pattern of the LFO. Available waveforms are triangle,
square, and random. Only one waveform is available at any time.
Mod Wheel switch and LED- This is a really handy, but potentially confusing feature, so
don’t skim this section. If the switch is in the off position (left), the LFO is always “on.” Its
effects will be immediately audible by moving the Tone Sources, Poly, and Filter modulation
amount sliders. Clicking to the on position (right, LED lit) enables control of modulation
depth with an external keyboard controller mod wheel. If the mod wheel is all the way
down, modulation depth is zero. This makes setting up a mod wheel to add vibrato or wah
effects very easy. If it seems like the LFO isn't working, check if the Mod Wheel switch is
engaged.
Auto Contour Trigger- When set to the In position, the Counter Generator repeatedly
triggers at the current Modulation rate. This is particularly useful when used in a DAW and
combined with the Ext Sync switch (more on this below).
Rate and Ext Sync- When the Ext Sync switch is off, the Rate slider sets the modulation rate
from 0.3 to 31 Hz.
Engaging the Ext Sync switch locks the modulation master tempo. When engaged, the Rate
slider snaps to note values ranging from 8 beats up to 1/64th note triplets. Ext Sync mode
locks to the tempo in the top toolbar when using the DCO-106 standalone version, or to the
current project tempo when the plug-in version is used in a DAW.

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Tone Sources, Poly, and Filter modulation amount sliders- These independently set the
amount of modulation routed to the Tone Sources, Poly, and Filter sections respectively.
Setting moderate but different amounts of modulation to the Tone Sources and Poly
sections is particularly useful for creating naturally chorused sounds using both sections.
Keyboard Glide- Also known as "portamento," glide delays the voltage change between
pitches for a sliding effect. Keyboard Glide only affects the Tone Sources - it does not affect
pitches in the Poly section.

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8Mixer Section
The Mixer section is where all MG-1 Plus
signals are mixed together before going to
the Master Volume control and onto the
output.
Tone One- Sets the level of Tone Source
One.
Tone Two- Sets the level of Tone Source
Two.
Noise- Sets the level of the Noise generator.
We haven't mentioned the Noise generator
up to this point, because it has no other
controls, but it creates random noise
containing all frequencies at relatively equal
amplitude. Like the Tone Sources, the Noise
generator is routed through the filter and
amplifier.
Bell Tone- Sets the level of MG-1 Plus' pseudo ring mod section*. This multiplies the signals
of Source One and Tone Source Two together, typically resulting in a metallic tone with
inharmonic overtones often used to recreate pitched percussion instruments such as bells
and chimes. Manipulate the Tone Source Octave controls and Tone Source Two's Detune
knob to best hear its effects.
Poly- Sets the level of the Poly section. It does not want a cracker.
Master Volume and meter- This isn't in the Mixer section, but it sets MG-1 Plus's final
volume. The meter is a five-LED affair and should be set like any other meter; it should
nominally sit around the third and fourth LED from the bottom.

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9MIDI Controllers Setup and The MIDI Tab
Assigning internal and external hardware controls adds a whole new dimension of control
and musicality to patches, and it's really easy to do. The MIDI Tab is where all controller
assignments can be viewed and tweaked. First we'll show how to assign an external
hardware controller to an MG-1 Plus control, then we'll go over all parameters in the MIDI
Tab.
9.1 Basic External Hardware Control Assignment
This is the quick, "I just want to assign a hardware control right now!," section. We
recommend reading this whole section to best take advantage of MG-1 Plus' swift MIDI
control assignments. We also recommend reading "On A Clear Day You Can See General
Motors" by Patrick J. Wright, but that's not important right now.
In this example, we’ll assign a hardware slider control to the filter cutoff frequency.
Begin by right-clicking on the Freq slider in the VCF section and
selecting MIDI Learn. A transparent purple overlay appears over the
slider indicating that it's in learn mode. Now move the desired
hardware control device. The purple overlay disappears and the
hardware control will move the onscreen slider. If you get cold feet
(or accidentally put the wrong control into learn mode), learn mode
can be aborted by right-clicking and selecting Stop Learning.
This is the basic procedure for assigning hardware controllers to almost any MG-1 Plus
control.
When in MIDI learn mode, any previously assigned
controller numbers will show in squares. These
indicate the MIDI continuous controller number of
the assigned hardware control (these are also
displayed in the MIDI library tab at left).
Once a MIDI controller has been assigned, in addition
to real-time control of a MG-1 Plus parameter, you’ll
also be able to record and play back controller data
from a DAW.

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9.2 The MIDI Tab
This is command central for all MIDI controller assignments. Here you’ll be
able to see information about all currently assigned controllers and adjust
control ranges.
To view or hide the MIDI Tab, click the MIDI button in the top toolbar.
MIDI Learn button- This is almost exactly the same as enabling MIDI learn mode by right-
clicking a control. Click the MIDI Learn button to enter learn mode (all controls turn purple).
Unlike right-clicking on specific knobs, where MG-1 Plus automatically exits controller
assignment mode, clicking the MIDI Learn knob "stays on" to enable assignment of multiple
hardware controls. This is handy for quickly assigning a bunch of sliders or the buttons of a
grid-style controller.
To assign multiple controls, click MIDI Learn, click an on-screen control, move the desired
hardware knob or slider, continue clicking and assigning on-screen controllers until all
desired controls are assigned, then click Stop Learning to exit learn mode.
Remember that a single hardware knob/slider/button isn't limited to controlling just one
parameter - a single hardware controller can simultaneously operate as many controls as
you'd like.
9.3 MIDI Tab Columns
Name- Displays the name of the parameter being controlled.
Type- There are five possible types of controller automation in MG-1 Plus:
Note- Notes played on a MIDI keyboard controller, expressed as C-1 to G9
CC (MIDI Continuous Controller)- The standard 128 MIDI controller numbers as
defined in the MIDI spec. More specifically, these are the controllers transmitted by
hardware knob and slider controls. MIDI CC’s can be used to control parameters in
real-time or recorded and played back within DAW software.

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MMC (MIDI Machine Control)- The MIDI control protocol for tape machine-style
transport controls. Back in the dark ages, this was used to control wonky old Tascam
and Fostex reel-to-reel monsters, but it's useful if your MIDI controller has tape-style
transport control buttons.
Pressure- Most modern keyboard controllers transmit controller data when keys are
pressed and released as they're held down. The vast majority of keyboard controllers
with aftertouch transmit "mono" aftertouch only; in other words, aftertouch data is
the sum of all keys to one single data stream. Note that MG-1 Plus only responds to
mono aftertouch.
Key- This allows keys of the computer QWERTY keyboard to at as button controls for
MG-1 Plus' onscreen controls.
Value- Displays the specific automation controller. In the case of a Note this would show a
MIDI note number (C-1 to G9, for a MIDI CC, this would be the MIDI CC controller number,
etc. Clicking on the value opens a pop-up menu where all values are displayed and can be
selected.
Min- Sets a limit on the lowest value any automation control can set a mapped controller to.
This actually recalibrates the range of the automation controller to the remaining parameter
range.
Max- Sets a limit on the highest value any automation control can set a mapped controller
to. This actually recalibrates the range of the automation controller to the remaining
parameter range.
Super Tricky Min-Max Tricks- Not only can parameter ranges be limited via the the
Min and Max knobs, mapped control destinations can be completely inverted by
setting the Min knob all the way up and the Max knob all the way down (or
anywhere in between).
Limiting and inverting parameter ranges with the Min/Max controls is particularly
useful when multiplexing a single hardware control to operate multiple parameters.
Along with the Curve control, the customization possibilities are super flexible.
Curve- These allow the customization of how incoming MIDI CC controls affect the
movement of MG-1 Plus' onscreen controls, ranging from exponential to linear to
logarithmic curves.
9.4 MIDI Tab Column Configuration Right-Click Menu
Right-clicking anywhere in the top row (Name, Type, Value, etc.) displays the
column configuration menu. Checking/unchecking these allows hiding and
display of each column. This has no effect on assignments.

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9.5 MIDI Tab Parameters Right-Click
Right-clicking on an assigned parameter opens the menu below.
MIDI Learn- This is used to change the controller assigned to a particular
parameter.
Unlearn- Deletes the selected automation parameter.
Unlearn All-Deletes all controller assignments for the patch. MG-1 Plus will display a
warning dialog prior to deletion in order to thwart potential unlearn-related disasters.

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10 QWERTY Musical Typing Keyboard (MTK)
If you don't have a MIDI keyboard attached to your computer, the standard QWERTY
computer keyboard can be used to play notes - we're pretty sure you've got one of those!
We'll refer to this as the "MTK." Following is a list of MTK keyboard modifiers and functions:
Opening and Closing the MTK - click the the circular keyboard icon in the
top toolbar. To close the MTK, click the keyboard icon in the top toolbar,
or click the X in the top right corner.
Play Notes- To trigger notes, simply press the corresponding computer keyboard key or
mouse click the onscreen keys.
Adjust Currently Visible MTK Range- Slide the purple scroll bar horizontally to adjust the
currently visible keyboard range.
Adjust Overall Visible Keyboard Range- Clicking and dragging the right edge of the MTL
window allows the overall size of the window to be adjusted. This lets you view more or less
of the onscreen keyboard. Note that the MTK window's borders cannot exceed the overall
outside dimensions of the MG-1 Plus window.
Shift Range Up/Down Octave- Click the OCT- and OCT+ buttons at the top left and right of
the onscreen MTK. The current range is displayed above the keyboard.
Shift Range Up/Down Semitone- Click the STEP- and STEP+ buttons at the bottom left and
right of the onscreen MTK. The current range is displayed above the keyboard.
Hide/View Controllers- Clicking CONTROL at the far left hides and displays velocity, bender,
mod, and sustain control parameters. Hiding the control view makes more space available
for the keyboard.
Set Note Velocity- Move the purple VELOCITY bar to adjust the output velocity of notes.
This will only be audible if the VEL sliders in the VCF or VCA sections are raised.