LinPlug SaxLab User manual

u s e r m a n u a l
Copyright LinPlug Virtual Instruments GmbH 2008.
All rights reserved.

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Welcome
hank you for purchasing a LinPlug SaxLab 2 license.
SaxLab 2 is a professional, flexible and easy-to-use virtual wind instrument
designed for creating music on your computer.
SaxLab 2 uses multi-sample playback of wind-instrument samples and
incorporates a specially designed four-voice crossfade system that is capable
of creating highly realistic wind instrument sounds. SaxLab 2’s key features
include an easy-to-use interface, a wide range of high-quality samples, an
effects section that includes chorus and reverb, as well as extensive real-time
modulation options. Special attention has been paid to making the
performance controls as rich and responsive as possible, so that the
instrument can be realistically “played”.
his manual describes all aspects of SaxLab 2 and is designed so that your
use of this software is as efficient and enjoyable as possible. At LinPlug we're
very proud of SaxLab 2; it's the result of many years of research and
synthesizer programming experience. We hope you get a lot of pleasure using
SaxLab and that it becomes an integral part of your music-making.
Peter Linsener and the LinPlug team, January 2008
Concept by Luigi Felici and Peter Linsener
Instrument by Luigi Felici, Peter Linsener and Pavol Markovič
Graphics by Shaun Ellwood and Branislav Pakić
Sounds by Luigi Felici
Manual by Chris Share
Special hanks to Wellington and William
All technical specifications of the product specified in this manual may be subject to change
without notice. he document may not be changed, especially copyright notices may not be
removed or changed. LinPlug and all LinPlug product names are trademarks of LinPlug
Virtual Instruments GmbH. Mac and the Mac logo are trademarks of Apple Computer, Inc.,
registered in the U.S. and other countries. he Built for Mac OS X graphic is a trademark of
Apple Computer, Inc., used under license. he Audio Units logo and the Audio Units symbol
are trademarks of Apple Computer, Inc. Microsoft® and Windows® are trademarks of
Microsoft Corporation, registered in the U.S. and other countries. Cubase and VS are
registered trademarks of Steinberg Media echnologies GmbH. All other trademarks are the
property of their respective owners.
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Table of Contents
Welcome............................................................................................................2
able of Contents...............................................................................................3
Installation..........................................................................................................4
Features.............................................................................................................5
What's New in SaxLab 2....................................................................................6
Overview............................................................................................................8
Main.................................................................................................................10
Body.................................................................................................................12
une.................................................................................................................13
Presets.............................................................................................................15
ECS..................................................................................................................16
Amplitude Envelope.........................................................................................17
Performance....................................................................................................19
LFO..................................................................................................................27
Deviation..........................................................................................................30
Effects..............................................................................................................32
Chorus..........................................................................................................32
Reverb..........................................................................................................33
Rear Panel.......................................................................................................34
Registration......................................................................................................35
Support.............................................................................................................35
Glossary...........................................................................................................36
MIDI Implementation Chart..............................................................................38
Appendix A: Using UN Files..........................................................................39
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Installation
Installation on PC
SaxLab 2 comes with its own Installer. After downloading SaxLab 2 you will
find a file named "SaxLabInstallerNNN.exe" (where NNN is the respective
version number) located in your web browser’s download folder. Double-click
on this program to begin the installation process. he Installer will guide you
through the installation process.
Make sure you choose the right installation directory, so your host software
finds the SaxLab 2 VS i. Refer to your host software's manual if you are
unsure about where the host software plug-in directory is located.
he instrument file "SaxLab2.DLL" will be placed in the chosen directory.
Additional data is installed in your Application Data folder. he SaxLab 2
Presets are installed into “My Documents/LinPlug/SaxLab”. he next time you
start your host software SaxLab 2 will be listed in the VS Instrument list.
Installation on Mac
SaxLab 2 comes with its own Installer. After downloading SaxLab 2 you will
find a file named "SaxLabInstaller200.dmg" located in your web browser’s
download folder. Double-click this file to decompress and open the image,
then double-click the installer program to begin the installation process.
he installer will guide you through the installation process. he instrument
file "SaxLab" and the SaxLab 2 Presets will now be placed in the appropriate
directory for virtual instruments on your Mac. he next time you start your host
software SaxLab 2 will be listed in the AU and VS instrument list.
Common to Mac and PC
Once SaxLab 2 is installed it must be registered using your personal serial
number. his registration process is described in the Registration section of
this manual.
If you have any questions regarding the installation of SaxLab 2 please
contact our support team at www.linplug.com/support/support.htm.
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Features
SaxLab 2 contains a range of features designed to make your music-making
more efficient and enjoyable. hese features are listed below:
§Monophonic multi-sample playback with internal four-voice
crossfade.
§An adjustable mix of three sound layers for each note: the “Air”
layer, the “Keys” layer and the “Pitched” layer.
§Air/Keys and Pitched sound layer crossfade point is set by MIDI
velocity.
§Many different SoundSets for various wind instruments.
§User-definable, velocity-sensitive amplitude envelope.
§onal characteristics of the instrument’s overall sound can be
defined by the user.
§Real-time control of the instrument’s brightness, reverberation
amount and “Growl” effect.
§hree modes of mono performance: Legato, Retrigger, Alternate
§Control of Pitch Bend and Scoop.
§Random pitch deviation per note.
§Random “air” deviation per note.
§Random body frequency deviation per note.
§Envelope, LFO and MIDI-controlled vibrato and tremolo.
§Stereo chorus and stereo reverb effects.
§Microtuning support.
§MIDI control available for every instrument parameter.
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What's New in SaxLab 2
§he “Velocity to Envelope” control present in the first version of SaxLab
has been replaced with a new “Enhance” (ENH) control for enhancing the
attack transients of notes. he “Velocity to Envelope” function (resulting
in a quicker attack upon higher velocity) is still present however it is no
longer adjustable by the user. he new control can be used to improve
the sound of attack transients and increases realism in the case of
staccato or funky sax playing.
§he Volume, Keys and Air controls, which set the respective levels of the
instrument's three sound layers, are now routed in parallel so that the
relative level of each layer can be independently adjusted.
§A control named C (Crossfade ime) has been added to SaxLab's
Performance section. he C (Crossfade ime) control sets the time
between two legato notes when the smooth fade from the current tone to
the next takes place. he actual time taken is determined by the length of
the previous notes that have been played. his means that the used
Crossfade ime increases for notes with a longer duration and decreases
for notes with a shorter duration. he maximum time is set by the C
control.
§he Performance section has been completely reworked and now
contains many more control sources and destinations for real-time
control and expression.
he Performance section features a new MIDI Exp subsection which is a
small modulation matrix customised for sax playing. he MIDI Exp
subsection makes Velocity, Breath Controller, and Aftertouch available
as modulation sources.
Amplitude, Brightness Level, Reverb Mix, as well as a new effect called
“Growl”, are available as modulation destinations. Sensitivity and
mapping curve parameters are available for all modulation destinations.
§he new Growl effect is designed to reproduce the “growl” sound which
is a typical component of the sound of a saxophone. his effect features
controls for depth and Growl tone can be randomized for more variation.
§he LFO has been improved and now uses a new waveshape. It also
has a better "attack" characteristic so as to create a more natural sound.
§he Air parameter now has a dedicated control in the Deviation section.
his means that each note's “Air” component can be randomised,
creating more timbral variation from note to note.
§he reverb algorithm has been improved so that it sounds more natural.
In addition to this, the Reverb Mix parameter is available as a modulation
destination in the MIDI Exp section.
§he microtuning system has been updated so that the instrument now
uses standard UN files. his means that the number of microtuning
systems available for use is vastly increased.
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§Instrument Presets are now managed using the standard LinPlug system
which is found on all other LinPlug instruments.
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Overview
SaxLab 2 is a monophonic wind instrument synthesizer with some unique
features. he synthesizer is based upon a multi-sample-playback design and
includes a three-layered, four-voice crossfade for each note produced.
he structure of SaxLab 2 synthesizer can be divided into nine sections:
une, Preset, Envelope, Body, Main, Performance, LFO, Deviation and FX
(Effects).
Audio signals are generated by a sample-playback synthesizer that gets pitch
,velocity and controller information from the instrument's MIDI input. he MIDI
input is automatically connected to MIDI output of the host software. SaxLab 2
receives MIDI on all channels simultaneously.
SaxLab2’s Sound Set determines the samples that are used by the
instrument. he Sound Set is selected in the Sound Set popup menu located
in the Main section. he particular scale tuning used by the SoundSet is set in
the instrument’s une section, along with its overall tuning settings.
In SaxLab 2, a note consists of three layers: the Main layer, the Keys layer
and the Air layer. he Main layer contains the pitched component of the
sound. he Keys layer contains the characteristic key “clicks” heard in some
wind instruments (especially in saxophones and clarinets ). he Air layer
contains the breath and “airflow” sounds that are an important part of the
sound of a wind instrument.
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he relative levels of the three layers are set using controls in the instrument’s
Main section. he relative levels of the three layers also respond to MIDI note
velocity. For example, when playing soft notes, the volume level of the Air and
Keys layers increases with respect to the Main layer. his replicates the
behaviour of a real wind instrument which becomes relatively “noisier” as it is
played more quietly. When playing louder notes the Main layer becomes
proportionately louder and comes to dominate the sound.
he Main layer of each SaxLab 2 note also includes an internal four-voice
crossfade which enables smooth legato transitions from one part of a note’s
envelope to another. his crossfade also enhances note-to-note transitions
which are very important in recreating realistic wind instrument sounds.
he output of the sample-playback oscillator is routed to SaxLab 2’s Body
section. he Body section contains a filter which modifies the frequency
spectrum of the oscillator's output. Here the overall tonal characteristics of the
currently loaded SoundSet can be modified.
An important part of the sound of a real acoustic instrument arises from the
real-time modulation of its sound. SaxLab 2 enables the user to modulate its
sound using three sources: envelopes, LFOs (Low Frequency Oscillators) and
MIDI controllers.
SaxLab 2’s Amplitude Envelope section is used to control the way that the
instrument’s amplitude varies over time and includes controls for Attack ime,
Decay ime and Release ime. A second modulation source is SaxLab’s LFO
which can be mapped to either or both of the sound’s amplitude and pitch and
so can be used to create either tremolo or vibrato effects. A third modulation
source is real-time MIDI controllers. hese can be mapped to numerous
destinations. Examples include MIDI Velocity to the amplitude envelope
depth, Modulation Wheel to LFO depth and MIDI Breath Control to brightness.
Note that for a realistic emulation often the control of SaxLab “Bright” by
Velocity leads to a more realistic performance than using the “Amp” by
Velocity. Actually Velocity should control more of the brightness (“Bright”) and
less of the amplitude (“Amp”).
Another important part of the sound of a real acoustic instrument is that no
two notes are exactly the same. No matter how hard the player may try, each
note is slightly different. Our ears are very sensitive to these differences and
can easily detect when two notes are identical. For this reason, SaxLab 2
incorporates Body, Air and Pitch Deviation controls which introduce small
random variations to the Body filter, the “air” component of the sound, and to
the overall pitch of the note each time a note is triggered.
SaxLab 2’s Effects section contains two effects: Chorus and Reverb. he
Chorus effect can be used to "thicken" a single sound creating the impression
that it contains multiple voices. he Reverb effect is used to create the
impression that the instrument is being played in a real acoustic space.
he audio outputs of SaxLab 2 are automatically connected to the input of
your host software's mixer. Here you can set the pan position of SaxLab 2's
output. Hopefully, this section has given you a brief overview of how SaxLab 2
works. More detailed information can be found in the following sections.
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Main
SaxLab 2’s Main section is located in the middle of the instrument’s Front
Panel. It contains controls for selecting the current Sound Set as well as for
setting the relative levels of the instrument’s three sound layers. It also
contains a MIDI indicator that shows when incoming MIDI Note-on messages
are received.
Sound Set: SaxLab 2’s Sound Set control is used for selecting the current
Sound Set. Each Sound Set is a collection of samples that the instrument
uses to generate sound. Each Sound Set is made up of three layers: the Main
layer, the Air layer and the Keys layer. hese three layers are mixed to
produce the instrument’s overall sound. he Sound Set should not be
confused with a Preset. he former is a collection of samples used by the
instrument, while the latter is a “snapshot” of all the instrument’s current
settings, and an associated Sound Set. As such, many Presets can utilize the
same Sound Set.
Keys: he Keys control sets the volume of the Keys sample layer. his layer
contains the characteristic key “clicks” usually heard in saxophones and
clarinets. Increasing the value of the Keys control makes the Keys layer
louder with respect to the instrument’s other two layers.
VOL (Volume): he VOL (Volume) control sets the volume of the pitched
sample layer. his layer contains the pitched component of the sound.
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Increasing the value of the VOL (Volume) control makes the pitched
component of the sound louder with respect to the instrument’s other two
layers.
Air: he Air control sets the volume of the Air sample layer. his layer
contains the breath and “airflow” sounds that are an important part of the
sound of a real wind instrument. Increasing the value of the Air control makes
the Air layer louder with respect to the instrument’s other two layers.
Note: When using “Layered” or “Soft” Sound Sets it is recommended to only
use very low “Air” noise settings since these sets include soft played tones
which are naturally already noisy.
MIDI: he MIDI indicator lights up when any incoming MIDI Note-on
messages are received by SaxLab 2. Clicking and holding down a mouse
button while the cursor is over the MIDI indicator automatically plays a C3
note. he note is turned off when releasing the mouse button.
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ody
SaxLab 2’s Body section is located in the middle of the instrument's Front
Panel above the Main section. he Body section contains a filter with three
controls that allow you to shape the overall timbre of the instrument.
RES (Resonance): he RES control is used to set the amount of emphasis
around the filter’s cutoff frequency. Higher settings create a more pronounced
peak in the signal while lower settings produce a flatter response.
FREQ (Frequency): he FREQ control is used to set the frequency at which
the filter begins to take effect. Higher settings produce brighter sounds while
lower settings result in darker sounds.
Bright (Brightness): he Bright control is used to set the brightness of the
instrument’s sound. Higher settings will produce a more strident tone, while
lower settings will produce a softer, cooler sound.
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Tune
SaxLab 2’s une section is located on the upper left of the instrument’s Front
Panel. his section consists of four controls: Coarse ( une), Fine ( une), the
uning Display and Scale.
Coarse ( une): he Coarse ( une) control is used to set the overall pitch of
the instrument in semitone steps. Control settings range from -11 semitones
to +11 semitones.
Fine ( une): he Fine ( une) control is used to set the overall pitch of the
instrument in cents. A cent is 1/100 of a semitone. Control settings range from
-100 cents (-1 semitone) to +100 cents (+1 semitone).
Note that the overall pitch of the instrument can be raised or lowered by one
octave using a combination of the Coarse une control and the Fine une
control.
Also note that the Coarse une control and the Fine une control are used to
set the root note of the current scale. he controls transpose the scale’s
starting pitch to the selected pitch. Remember that if you use tunings other
than Equal emperament, the overall pitch of the instrument must be set to
the root note of the key in which you wish to work. Otherwise, the notes of the
scale will not have the correct pitch.
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uning Display: he uning Display is located to the right to the two tuning
controls. It displays the instrument’s current tuning in semitones and cents.
For example, a setting of “+4.79” means that the instrument is currently tuned
4 semitones and 79 cents sharp of its default setting.
Scale: he Scale control is used to set the Micto uning ( UN) file that
SaxLab 2 uses. he UN file is a list of pitches that the instrument uses to
determine the pitch at which it plays back samples. Most Western music uses
a pitch system called Equal emperament in which the smallest interval
between two adjacent notes is defined by the ratio 1:1.05946. For example,
A4 has a frequency of 440 Hz. In this case, A#4 (the next highest note
available on a keyboard) has a frequency of 440 x 1.05946 which equal 466.2
Hz.
SaxLab 2 comes with a wide selection of different UN files. For more about
UN files please see Appendix A: Using UN Files.
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Presets
SaxLab 2’s Presets section is located on the upper right of the instrument’s
Front Panel. he Preset section contains the Preset Display and File Browser
as well as the MIDI Learn ECS.
Preset Display/File rowser
Preset Display/File Browser: he Preset Display consists of two displays. he
upper one shows the Current Bank and the lower one shows the Current
Preset. Whenever a new Preset is loaded using the file controls found below
these displays, the Current Preset display is updated with the name of the
new Preset and the Current Bank is updated with the name of the directory
that contains the new Preset.
By default the File Browser points to the factory presets installed with SaxLab
2. Presets can be changed in three different ways. A new Preset can be
loaded using the file controls, which work by clicking the Prev/Next (“arrow”)
buttons located below the Current Preset display. Alternatively, the desired
Preset can be selected directly from the Current Preset display, which turns
into a menu when it is clicked. A Preset can also be changed by sending a
MIDI program change command to the instrument.
he Current Bank can be changed by loading a Preset from a different
directory or by selecting the desired location from the Current Bank display,
which turns into a menu when it is clicked.
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he File Controls located to the right of the Prev/Next (“arrow”) buttons are
used for all File-related operations. he Load button opens a dialog that lets a
previously saved Preset be selected for loading. he Save button allows the
current settings to be saved as a new Preset.
he settings of all sections are saved with the Preset. SaxLab 2 loads and
saves all of its Presets directly to hard disk so your computer's RAM does not
limit the number of available Presets. Note that when you load a Preset using
the Preset section's controls, the previous Preset is erased so if you want to
keep the previous Preset make sure you save it before loading another one.
ECS
he ECS (Easy Controller Setup) section makes it simple to control SaxLab 2
from an external MIDI controller (either hardware or software). All you have to
do is switch on the ECS indicator (click it once), select a SaxLab 2 parameter
with the mouse and then send some MIDI messages to the SaxLab 2 from
your MIDI source. hat's all there is to it! From now on you can change the
parameter with that controller. In addition to this, more than one controller can
be defined to change a particular parameter. In fact, you can define up to 128
parameter-controller-combinations. his does not depend on the type of
controller you have nor the particular MIDI Control Change messages it
sends. Don't forget to switch off ECS after you have finished using it. o do
this, click the indicator again.
Clicking on the ECS label opens the ECS menu. he menu contains the
following functions: Off, Learn, Clear, Clear All, Save, Rest.Fact. (Restore
Factory Settings). hese functions are explained below.
Off: he Off menu item turns off ECS. If ECS is already off then selecting this
menu item has no effect.
Learn: he Learn menu item turns on ECS. Once ECS is on, a target control
can be selected with the mouse. Any MIDI Control Change messages sent to
the instrument will then be routed to the selected control.
Clear: he Clear menu item turns on ECS and prepares the instrument for the
disconnection of previously-assigned MIDI Control Change messages from
their destinations. After selecting the Clear menu item, clicking on a SaxLab 2
control disconnects the previously assigned MIDI controller from the selected
destination. After clearing a SaxLab 2 control, the selected control no longer
receives MIDI Control Change messages.
Clear All: he Clear All menu item disconnects all previously-assigned MIDI
Control Change messages from their destinations. After clearing all SaxLab 2
controls, no control receives MIDI Control Change messages.
Load: he Load menu item enables a previously saved MIDI controller routing
configuration to be restored.
Save: he Save menu item enables the current MIDI controller routing
configuration to be saved.
Rest.Fact: he Rest.Fact (Restore Factory Settings) restores SaxLab 2's
default ECS settings, which is equivalent to Clear All.
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Amplitude Envelope
SaxLab 2’s Envelope section is located on the middle left of the instrument’s
Front Panel. Because SaxLab 2 uses samples for playback, the envelope of
the sound it produces is determined to a large extent by the envelope of the
sample that is currently being played. his can be limiting, as it precludes
real-time control of the instrument’s amplitude. In order to make the
instrument more responsive to the player, SaxLab 2 contains an Envelope
section which incorporates four controls: ENH (Enhance), A (Attack), D
(Decay) and R (Release).
ENH (Enhance): he ENH (Enhance) control setting determines the degree to
which the first few milliseconds of a note's amplitude envelope are amplified.
he ENH (Enhance) control can be used to create a prominent attack
transient, so that the "piff" sound at the beginning of a note is emphasised.
his is very useful for creating rhythmic accents.
A (Attack): he A (Attack) control setting determines the length of time it takes
for the amplitude envelope to reach the full envelope depth. For example, if
the A (Attack) slider is set to 0, the sound’s amplitude will move from zero to
full volume within the shortest possible amount of time.
D (Decay): he D (Decay) control setting determines the length of time that
the amplitude envelope takes to move from the Attack peak level to the
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Sustain level. Setting the D (Decay) slider to higher values increases the time
taken for the sound’s amplitude to move from full volume to the sustain level.
R (Release): he R (Release) control is used to set the length of time that the
amplitude envelope takes to move from the current level to silence after the
key is released. Setting the R (Release) slider to higher values increases the
time taken for the sound’s amplitude to decrease to zero.
Note: he Sustain level is is reached at the end of the Decay phase and is
fixed at 50% of the maximum level (that is reached at the end of the Attack
phase).
he time range of A and R are actually useful only for special effects, as a
real sax doesn't have a meaningful release time and the attack time is
controlled in realtime by the player. So for a good emulation these parameters
should stay close to zero (bottom of the fader), but not zero. For a slow attack
the attack time (or the main volume) should be controlled by a MIDI controller
(see section ECS).
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Performance
he Performance section is located on the middle right of SaxLab 2’s Front
Panel. he Performance section features the following controls:
•Scoop (Amount),
•PB- (Pitch Bend Down Amount) with Display,
•PB+ (Pitch Bend Up Amount) with Display,
•AMP (Amplitude) Depth, Control Source and Control Response Curve,
•BRI (Brightness) Depth, Control Source, and Control Response Curve
•REV (Reverb) Depth, Control Source and Control Response Curve
•GRO (Growl) Depth, Control Source, Control Response Curve,
•Maximum Depth and Deviation,
•C (Crossfade ime) and
•Monomode.
Scoop (Amount): his control is used to set the amount of time it takes to
move from a lower pitch to the pitch of the note that is actually played.
Increasing the value of the Scoop control increases the time taken for the
pitch to move from the lower pitch to the note that is actually played. Scoop
can be thought of as an auto-bend that is applied at the onset of a note.
Scoop is not applied to notes that are played legato. he scoop is a style
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mode used in sax playing and it]s often used in Jazz and Rock since it's easy
with sax and clarinet to initially pitch the note lower than intended.
PB- (Pitch Bend Down Amount): his slider is used to set SaxLab 2’s
response to incoming MIDI Pitch Bend messages that are below the midpoint
of the MIDI controller's Pitch Wheel. he slider can be adjusted over a range
of 0 to 12 semitones. he current value of the PB- control is shown in the
Pitch Bend Down Range Display which is located above the slider. Note that
downward Pitch Bend only operates in the lower half of the Pitch Wheel’s
range. Increasing the value of the PB- (Pitch Bend Down Amount) control will
increase the range of the lower half of the instrument’s Pitch Wheel.
PB+ (Pitch Bend Up Amount): his slider is used to set SaxLab 2’s response
to incoming MIDI Pitch Bend messages that are above the midpoint of the
MIDI controller's Pitch Wheel. he slider can be adjusted over a range of 0 to
12 semitones. he current value of the PB+ control is shown in the Pitch Bend
Up Range Display which is located above the slider. Note that upward Pitch
Bend only operates in the upper half of the Pitch Wheel’s range. Increasing
the value of the PB+ (Pitch Bend Up Amount) control will increase the range
of the upper half of the instrument’s Pitch Wheel.
Note: Scoop and Pitch bend ranges must not be abused for a realistic Sax
sound, best is to use small values so that the formants of the sax are
preserved.
AMP (Amplitude Control Depth): his control sets the degree to which the
currently selected control source (see below) affects the instrument's
amplitude which is set in the Main section. Increasing the value of this control
makes the instrument more responsive to changes in the incoming MIDI data.
Amplitude Control Source: his control is used to set the type of MIDI control
change message that controls the instrument’s AMP (Amplitude Control
Depth) setting. hree options are available: Velo (Velocity), BC (Breath
Controller) and A (Aftertouch). Only one type of MIDI Control Change
message can be used at a time .
Amplitude Control Response Curve: his setting determines how the AMP
(Amplitude Control Depth) control responds to incoming MIDI messages
selected with the Amplitude Control Source. he control is continuously
variable and ranges from inverse logarithmic through linear to logarithmic. he
chosen shape works as a “transfer function” which scales the incoming MIDI
messages so that their “effective working range” is changed. his can be used
to make the instrument more sensitive to MIDI control change messages in a
particular portion of the controller's range. For example, in the case of a
logarithmic curve, the effective working range is scaled upwards so that
changes in the upper portion of the controller's range have most effect on the
destination. A linear curve passes the MIDI messages unchanged.
Bright (Brightness Depth): he Bright control sets the degree to which the
currently selected control source (see below) affects the Body section’s Bright
(Brightness Depth) control. his in turn sets the overall brightness of the
instrument’s sound. Increasing the value of this control makes the instrument
more responsive to changes in the incoming MIDI data.
LinPlug SaxLab User Guide 2.0.3