Hammond Sk PRO User manual

MONO SYNTH
VOICE
SECTION

MONO SYNTH Voice Section2
MONO SYNTH Voice Section
The MONO SYNTH Voice Section, as the name implies, is a monophonic synthesizer utilizing physical
modeling to create the sounds and effects of classic analog synthesizers. There are several
individual“Oscillator Types” which can be modified by the Filter (timbre), Amplitude (volume), Section
Effects (Multi Effects and Overdrive) and the Equalizer. Timed characteristics such as LFO and Envelope
Generators for Pitch/Filter and Amplitude are also provided.
To hear the MONO SYNTH Voice Section, Press the SYNTH button in the ALLOCATE button section. The
LED will light.
uMONO SYNTH Controls
The controls for the MONO SYNTH are located to the right side of the Information Center Display.
These controls are explained starting below.
tVOLUME Rotary Control
This control allows you to adjust the volume of the MONO SYNTH Section.
Turn this Rotary Control to the right to increase the Volume.
Turn this Rotary Control to the left to decrease the Volume.
tOCTAVE buttons
These controls allow you to select the Octave range in which the MONO SYNTH will play.
You can select from -2 (up to two octaves down) to +2 (up to two octaves up).

MONO SYNTH Voice Section 3
tOSCILLATOR controls
An Oscillator is the basic sound-producing unit of an analog synthesizer. There
are several different types which produce different waveforms having different
harmonic structures. These in turn can be manipulated in various ways to
produce a wide variety of different musical effects.
The MONO SYNTH on the SK PRO follows the pattern of classic analog
synthesizers. “Mono” is an abbreviation for “monophonic,” meaning if
multiple notes are played on the keyboard, only one note will sound.
OSCILLATOR TYPE
The SK PRO has 6 audio oscillator settings which can be manipulated to produce a wide variety of tones.
These are explained starting below.
DUO
This setting utilizes two different pitched Oscillators. The first Oscillator (OSC1) sounds at “true pitch,”
while the second Oscillator (OSC2) can be transposed up or down by one (1) octave in half-step
increments. If the OSC2 LEVEL is set to 0, only OSC1 will sound. This Oscillator type is useful for Bass,
Lead and“chord”effects.
UNISON
This setting utilizes from one to seven Oscillators, one of which can be detuned against the other. It can
be used for celeste, chorus, or other purposely “out-of-tune” effects.
PULSE
A Pulse (or rectangular) waveform has a variable width known as the “duty cycle.” The sound can be
modified by changing the pulse width or duty cycle. For example, a duty cycle of 50% will produce a
clarinet-like sound while a duty cycle of 6% will yield a bright, brass-like tone quality.
SYNC
This setting utilizes two Oscillators which synchronize against each other to produce overtone effects.
FM
This setting utilizes two Oscillators or“operators. OSC1 is the“carrier tone” and OSC2 is the “modulating
tone.” You can create both “harmonic” and “inharmonic” tonal effects.
Adjusting the OSC2 pitch down creates wind-instrument sounds such as flute, brass, etc., while adjusting
the OSC2 pitch up is suitable for bell-like or“metallic” tones.
Setting the FB (feedback) at Half allows you to create string-type tones while Full is useful for unpitched
or “noise”-type tones.
NOISE
This setting creates unpitched sounds or“noise.<The sound changes from “noise<to “random pitched
tones<by controlling the sampling rate. A high sampling rate creates “seashore” type effects, a slightly
lower rate yields a “noisy percussion,<and a still lower rate creates effects suggestive of a“retro science-
fiction movie.” This setting utilizes two different pitched Oscillators similar to Duo.
OSCILLATOR PITCH & DEPTH sliders
These two sliders modify the selected Oscillator waveform.
NOTE: The DEPTH slider may have different functions depending on which Oscillator is selected.

MONO SYNTH Voice Section4
tLFO RATE Rotary Control
This control allows you to adjust the rate of the Low Frequency Oscillator (LFO).
Turn this Rotary Control to the right to increase the Rate.
Turn this Rotary Control to the left to decrease the Rate.
tPORTAMENTO RATE Rotary Control
This control allows you to adjust the rate of the Portamento feature.
Turn this Rotary Control to the right to increase the Rate.
Turn this Rotary Control to the left to decrease the Rate.
NOTE: Portamento refers to a smooth transition or “sliding” from one note to another.
NOTE: The PORTAMENTO button must be “ON” (orange LED lit) to hear the Portamento effect.
tFILTER CUTOFF Rotary Control
This control allows you to select the frequency at which the filter begins to have an effect
on the waveform’s frequency components.
tFILTER RESONANCE Rotary Control
This control allows you to Emphasizes the portion of the sound in the region of the cutoff frequency.
tFILTER EG DEPTH Rotary Control
This control allows you to adjust the depth of the filter envelope.

MONO SYNTH Voice Section 5
uWHAT IS “ADSR?”
“ADSR” is an acronym for Attack, Decay, Sustain and Release. These four Parameters allow you to change
different characteristics of the sound.
Attack refers to the amount of time for the sound to “build” to its peak level from its initial setting
when a key is first pressed.
Decay refers to the change from the peak level to a “sustain” level which will be maintained as long
as a key is held.
Sustain refers to the level at which the sound “arrives” and which will continue as long as a key is
held.
Release refers to the amount of time for the sound level to fade away to zero after a key is released.
uWHAT IS AN “ENVELOPE?”
Envelope refers to the behavior of the ADSR Parameters over time as a key is pressed and held.
The eight sliders on the SK PRO allow you to adjust Pitch, Filter and Amplitude Envelopes. The Pitch
Envelope allows you to control the pitch of the sound, the Filter Envelope will control the quality or
timbre of the sound and the Amplitude Envelope allows you to control the volume of the sound.
NOTE: If you access the Parameters in the SYNTH FUNCTION Mode, you will notice violet-colored shapes
either on the right side or at the bottom of the screen. These are visual representations of the Envelope shapes
of the selected Parameter. You will see their shapes change in response to the edits you make.
tPITCH & FILTER ENVELOPE sliders
These allow you to adjust the changing over time of the pitch and filter.
tAMPLITUDE ENVELOPE sliders
These allow you to adjust the changing over time of the amplitude or volume.

MONO SYNTH Voice Section6
uSelecting a MONO SYNTH Patch
TRY THIS:
1. Make sure COMBINATION F001 is selected (see the line at the top of the screen).
2. Press the SYNTH button in the ALLOCATE Section. The red LED will light.
The Information Center Display should now look similar to this:
3. Play some notes. You will now hear the current registration for the MONO SYNTH.
Notice the Patch number underneath “SYNTH” is highlighted.

MONO SYNTH Voice Section 7
uPATCH EDIT - SYNTH
This FUNCTION Mode allows you to modify the characteristics of the MONO SYNTH Voices according to
your preference.
tAccessing the PATCH EDIT - SYNTH FUNCTION Mode using the MENU/EXIT button:
1. From any of the PLAY Mode screens, press the MENU/EXIT button once. The Information
Center Display should now look like this:
The word “COMBINATION” should be highlighted.
2. Press the DIRECTION “q” button four times. The word “SYNTH” should be highlighted.

MONO SYNTH Voice Section8
3. Press the ENTER button. The Information Center Display should now look like this:
tAccessing the PATCH EDIT - SYNTH FUNCTION Mode using the Shortcut:
Press and Hold the HOLD TO EDIT button in the MONO SYNTH Voice Section, depending on
which Voice you want to edit. You will see the OSCILLATOR screen:
NOTE: The OSCILLATOR screen is actually the third screen of the PATCH EDIT - SYNTH FUNCTION Mode.

MONO SYNTH Voice Section 9
tAccessing the PATCH EDIT - SYNTH FUNCTION Mode via the APP MENU:
1. From any of the PLAY Mode screens, Press and Hold the MANUAL “ ” button. The
Information Center Display should now look like this:
The box “EDIT COMBINATION” should be highlighted.
NOTE: The APP MENU may not display all Voice Sections, depending on which Voice Sections
are active for the selected Combination.
2. Press the DIRECTION “q” button four times. The box “EDIT SYNTH” should be highlighted.
3. Press the ENTER button. The Information Center Display should now look like this:
You are now in the PATCH EDIT - SYNTH FUNCTION Mode. You may now use the
DIRECTION and PAGE buttons in conjunction with the VALUE knob to make various changes
to the Patches. These changes are explained starting on the next page.

MONO SYNTH Voice Section10
tGENERAL Parameters
NOTE: To see the MENU shown above after using the Shortcut, press the PAGE LEFT button two times.
LOUDNESS
VOLUME
This Parameter allows you to adjust the overall volume of the selected MONO SYNTH Patch. You can
select from 0 - (no Volume) to 127 (maximum Volume).
Turn the VALUE knob to the right to increase the Volume.
Turn the VALUE knob to the left to decrease the Volume.
NOTE: The Loudness Parameter serves to set the maximum volume of the selected MONO SYNTH Patch
and works independently of the SYNTH VOLUME knob. The overall volume of the MONO SYNTH Voice
Section is controlled by the SYNTH VOLUME knob. The MASTER VOLUME knob and/or a connected
Expression Pedal will control the volume of the entire instrument.
From the above screen, press the DIRECTION “q” button once.
The box to the right of “RANGE UP” should be highlighted.
PITCH BEND
RANGE UP
This Parameter allows you to adjust the number of semitones the Pitch Bend Wheel Wheel will bend the
pitch of the selected Patch up. You can select from 1 to 12 semitones, 12 semitones being a full octave.
Turn the VALUE knob to the right to increase the Range.
Turn the VALUE knob to the left to decrease the Range.

MONO SYNTH Voice Section 11
From the screen shown at the bottom of the previous page, press the DIRECTION “q” button once.
The box to the right of “RANGE DOWN” should be highlighted.
RANGE DOWN
This Parameter allows you to adjust the number of semitones the Pitch Bend Wheel will bend the pitch of
the selected Patch down. You can select from 1 to 24 semitones,, 24 semitones being two full octaves.
Turn the VALUE knob to the right to increase the Range.
Turn the VALUE knob to the left to decrease the Range.
From the above screen, use the DIRECTION buttons to move the cursor to the right side of the display
so the Information Center Display looks like this:
The box to the right of “PORTAMENTO” should be highlighted.
PORTAMENTO
ON / OFF
This Parameter allows you to turn the Portamento effect “ON” or “OFF” for the selected Patch.
Turn the VALUE knob to turn Portamento “ON” or “OFF.”
NOTE: As explained on page 276, Portamento refers to a smooth transition or “sliding” from one note
to another.

MONO SYNTH Voice Section12
From the screen shown at the bottom of the previous page, press the DIRECTION “q” button once.
The box to the right of “MODE” should be highlighted.
MODE
This Parameter allows you to adjust how to control the Portamento effect from the keyboard.
The data chart below shows the options you may select.
PORTAMENTO MODE
Parameter Description
Every The Portamento will be heard with every keypress.
Legato The Portamento will be heard only when keys are played “legato” (a key is depressed while
another key is held).
Turn the VALUE knob to make your selection.

MONO SYNTH Voice Section 13
From the screen shown on the previous page, press the DIRECTION “q” button once.
The box to the right of “RATE” should be highlighted.
RATE
This Parameter allows you to adjust the rate at which the pitch rises or falls when Portamento is “ON.”
You can select from 0 (the pitch will rise or fall instantaneously) to 127 (the pitch rises and falls at the
slowest rate). Intermediate rates will cause the pitch to rise or fall at rates between 0 and 127.
Turn the VALUE knob to the right to increase the Portamento Rate.
Turn the VALUE knob to the left to decrease the Portamento Rate.
NOTE: The PORTAMENTO button must be “ON” (orange LED lit) to hear the Portamento effect.

MONO SYNTH Voice Section14
From the screen shown on the previous page, press the DIRECTION “q” button once.
The box to the right of “PRIORITY” should be highlighted.
KEY
PRIORITY
This Parameter allows you to adjust which note will sound if more than one note is played. The data chart
below shows the options you may select.
KEY PRIORITY Settings
Parameter Description
Auto Sounds highest note played when used with other Sections. Sounds last played note when
used alone.
Last The last played note will sound
Lowest The lowest note played will sound.
Highest The highest note played will sound.
Turn the VALUE knob to make your selection.

MONO SYNTH Voice Section 15
From the screen shown on the previous page, press the DIRECTION “q” button once.
The box to the right of “EG TRIGGER” should be highlighted.
EG TRIGGER
This Parameter allows you to adjust whether the Envelope will reset each time a key is depressed.
The data chart below shows the options you may select.
LFO TRIGGER MODE
Parameter Description
Note The LFO of each note oscillates individually. Each LFO will start its cycle when a key is depressed.
Free Pressing a key will intercept the LFO at whatever point it happens to be in its cycle.
Turn the VALUE knob to make your selection.

MONO SYNTH Voice Section16
From the screen shown on the previous page, press the PAGE “u” button once. The LFO Page should
now display.
The box to the right of “TRIGGER” should be highlighted.
tLFO
This Page allows you to adjust the “Low Frequency Oscillator” (LFO, which creates Vibrato or Tremolo
effects) and its depth.
SETTING
These Parameters allow you to control the overall settings for the LFO.
TRIGGER MODE
This Parameter allows you to adjust whether the phase of the LFO will reset each time a key is depressed.
The data chart below shows the options you may select.
LFO TRIGGER MODE
Parameter Description
Note The LFO of each note oscillates individually. Each LFO will start its cycle when a key is depressed.
Free Pressing a key will intercept the LFO at whatever point it happens to be in its cycle.
Turn the VALUE knob to make your selection.

MONO SYNTH Voice Section 17
From the screen shown on the previous page, press the DIRECTION “q” button once.
The box to the right of “WAVEFORM” should be highlighted.
WAVEFORM
This Parameter allows you to select the waveform of the LFO.
The data chart below shows the options you may select.
LFO WAVEFORM
Waveform Description
Triangle A waveform which smoothly rises to a peak point and smoothly drops to a zero voltage.
Square A waveform which sharply rises to a peak point and sharplydrops to a zero voltage.
Rectangular Square A waveform which smoothly rises to a peak point and smoothly drops to a zero voltage.
Saw Up A sawtooth wave which ramps upward and drops sharply to a zero voltage.
Saw Down A sawtooth wave which ramps downward to a zero voltage and rises sharply.
S/H (Sample/Hold) Samples the input analog signal and holds the sampled signal for a specified time.
Fluctuation Random waveform with no periodicity.
Turn the VALUE knob to make your selection.

MONO SYNTH Voice Section18
From the screen shown on the previous page, press the DIRECTION “q” button once.
The box to the right of “RATE” should be highlighted.
RATE
This Parameter allows you to adjust the Oscillation Rate of the LFO. You can select from 0 (the slowest
rate) to 127 (the fastest rate).
Turn the VALUE knob to the right to increase the Rate.
Turn the VALUE knob to the left to decrease the Rate.
From the above screen, press the DIRECTION “q” button once.
The box to the right of ”DELAY TIME” should be highlighted.
DELAY TIME
This Parameter allows you to adjust the amount of time after the initial keypress before the LFO begins
oscillating. You can select from 0 (the LFO begins immediately) to 127 (maximum time).
Turn the VALUE knob to the right to increase the Delay Time.
Turn the VALUE knob to the left to decrease the Delay Time.

MONO SYNTH Voice Section 19
From the screen shown at the bottom of the previous page, press the DIRECTION “q” button once.
The box to the right of “ATTACK RATE” should be highlighted.
ATTACK RATE
This Parameter allows you to adjust the amount of time for the LFO to build to its full amount when using
Delay Time. You can select from 0 (the LFO begins immediately when a key is depressed) to 127
(maximum time).
Turn the VALUE knob to the right to increase the Attack Time.
Turn the VALUE knob to the left to decrease the Attack Time.
NOTE: Delay Time must be set to some value other than 0to hear the effect of this Parameter.
From the above screen, press the DIRECTION “q” button once.
The box to the right of “RATE KEY TRK” should be highlighted.
ATTACK RATE KEY TRACK
This Parameter allows you to adjust how the Attack Rate is modulated by the note or pitch. You can select
from 0 (no Key Tracking) to 127 (maximum Key Tracking - the Attack Rate increases as higher notes are
played).
Turn the VALUE knob to the right to increase the amount of Attack Key Tracking.
Turn the VALUE knob to the left to decrease the amount of Attack Key Tracking.

MONO SYNTH Voice Section20
From the screen shown at the bottom of the previous page, press the DIRECTION “q” button once.
The box to the right of “LFO DEP” should be highlighted.
LFO DEPTH
These three Parameters allow you to adjust the depth of the LFO for individual characteristics of the
sound. You can select from 0 to 127.
The data chart below shows the options you may select.
LFO DEPTH Options
Parameter Description
PITCH Allows you to adjust the depth of the LFO for controlling Pitch.
FIL Allows you to adjust the depth of the LFO for controlling the Filter
AMP Allows you to adjust the depth of the LFO for controlling Amplitude or Level.
Turn the VALUE knob to make your selection.