Two Notes Le Preamp Series User manual

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Le Preamp Series User's Manual
The complete electronic version of this manual, as well as the Two notes Audio Engineering software
and hardware products, are subject to updates. You can download the most recent versions of the
products on the Two notes Audio Engineering website.
This manual describes the Le Preamp and provides instructions for its operation. It is highly
recommended that you read this document before using the product. The contents of this manual
have been thoroughly verified and it is believed, unless stated otherwise, to accurately describe the
product at the time of shipment from the factory or download from our website.
Two notes Audio Engineering is a registered trademark of:
OROSYS SAS
76 rue de la Mine
34980 Saint-Gély-du-Fesc
France
Tel: [phone]
Fax: [phone]
Contact and support: http://support.two-notes.com
Website: http://www.two-notes.com

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This document is the exclusive property of OROSYS SAS. In the interest of product development,
OROSYS SAS reserves the right to change technical specifications, modify and/or cease production
without prior notice. OROSYS SAS cannot be held responsible for any damage, accidental or
otherwise, that results from an inappropriate use of the Le Preamp. Please refer to the safety
instructions included in this manual. The reproduction of any part of this document is strictly
forbidden without the written authorization of OROSYS SAS.
All product names and trademarks are the property of their respective owners. Product names and
trademarks found in this document were used during the development of the Le Preamp product but
are in no way associated or affiliated with OROSYS SAS.
1 Foreword
1.1 Important Safety instructions
Before using the product, it is necessary to carefully read and to bear in mind the1.
following information. Keep this document in a safe place as it is important for the
protection of the user and the product. If any malfunction of the machine is suspected, you
should always seek the assistance of a qualified technician.
Please verify that the voltage required by the mains power adapter matches the2.
voltage in your country. If not or if unsure, do not connect the machine to the wall outlet.
This could result in damage to the mains power adapter, the machine and injury to the user.
This product must not be used when there is lightning present. In case of severe weather with a
risk of lightning, unplug the power adapter to reduce the risk of electric shock and fire. The
mains power adapter provided with the machine complies with the standards of the country
where you purchased the product. If replacement is needed, please use a standard compliant
mains power adapter.
The Le Preamp must never be used near a heat source, near a flame, in the rain, in3.
damp areas or near any liquid of any sort. When transporting the unit, care needs to be
taken to avoid any shocks that could cause damage requiring the assistance of a qualified
technician.
Always use a dry and soft cloth with no alcohol or solvents for cleaning. Please keep4.
the unit clean and free from dust
All maintenance operations must be done by service centers approved by Two notes Audio5.
Engineering or by qualified technicians. Never try to repair the machine by yourself.
1.2 Contents of the package
The shipped package contains:
One Le Preamp unit in a protecting sleeve
One power adapter
One owner’s manual

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The complete electronic version of this manual, as well as the Torpedo Remote and Torpedo BlendIR
softwares are subject to updates. You can download the most recent versions of these products on
the Two notes Audio Engineering website.
1.3 Declaration of conformity
Manufacturer: OROSYS SAS
Category of product: analog audio signal processor
Product: Le Preamp
Test Manager: Guillaume Pille
The Two notes Le Preamp is certified to be compliant to the CE and FCC standards:
EN 55103-1 : 1996 and EN 55103-2 : 1996.
EN 60065 05/2002 + A1 05/2006.
EMC directive 89/336/EEC and Low Voltage Directive 73/23/EEC.
FCC Part 15 : 2008.
ICES-003 : 2004.
AS/NZS 3548 class B for Australia and New Zealand.
IEC : 2008 - CISPR 22 class B.
1.4 Disposal of Waste Equipment by Users in Private
Household in the European Union
This symbol on the product or on its packaging indicates that this product must
not be disposed of with your other household waste. Instead, it is your
responsibility to dispose of your waste equipment by handing it over to a
designated collection point for the recycling of waste electrical and electronic
equipment. The separate collection and recycling of your waste equipment at the
time of disposal will help to conserve natural resources and ensure that it is
recycled in a manner that protects human health and the environment. For more
information about where you can drop off your waste equipment for recycling,
please contact your local city office, your household waste disposal service or the
shop where you purchased the product.
1.5 Warranty
OROSYS SARL warrants that this TWO NOTES AUDIO ENGINEERING product shall be free of defects in
parts and workmanship when used under normal operating conditions for a period of two (2) years
from the date of purchase. This warranty shall apply to the original purchaser when purchased from
an Authorized TWO NOTES AUDIO ENGINEERING dealer.
IMPORTANT: PLEASE RETAIN YOUR SALES RECEIPT, AS IT IS YOUR PROOF OF PURCHASE

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COVERING YOUR LIMITED WARRANTY. THIS LIMITED WARRANTY IS VOID WITHOUT YOUR
SALES RECEIPT.
Defective products that qualify for coverage under this warranty will be repaired or replaced, (at
OROSYS SAS’s sole discretion) with a like or comparable product, without charge. In the event that
warranty service be required, Please contact your authorized TWO NOTES AUDIO ENGINEERING dealer
in order to obtain an RMA to return the complete product to the Authorized TWO NOTES AUDIO
ENGINEERING Service Center closest to you, with proof of purchase, during the applicable warranty
period.
Transportation costs to the service center ARE NOT INCLUDED in this limited warranty. OROSYS SAS
will cover the cost of standard ground return transportation for repairs performed under this warranty.
This limited warranty becomes void if the serial number on the product is defaced or removed, or if
the product has been damaged by alteration, misuse including connection to faulty or unsuitable
ancillary equipment, accident including lightning, water, fire, or neglect; or if repair has been
attempted by persons not authorized by OROSYS SAS.
Any implied warranties, including without limitation, any implied warranties of merchantability or
fitness for any particular purpose, imposed under state or provincial law are limited to the duration of
this limited warranty. Some states or provinces do not allow limitations on how long an implied
warranty lasts, so the above limitations may not be applicable.
OROSYS SAS ASSUMES NO LIABILITY FOR PROPERTY DAMAGE RESULTING FROM ANY
FAILURE OF THIS PRODUCT NOR ANY LOSS OF INCOME, SATISFACTION, OR DAMAGES
ARISING FROM THE LOSS OF USE OF SAME DUE TO DEFECTS OR AVAILABILITY OF IT
DURING SERVICE.
In case you must absolutely send your TWO NOTES AUDIO ENGINEERING product to any other
location, it is of vital importance that you keep the original packing material. It is very difficult to
avoid damage when shipping the product without that material. OROSYS SAS is not responsible for
damages caused to the product by improper packaging and reserves the right to charge a reboxing
fee for any unit returned for service without the original packing material.
THE FOREGOING CONSTITUTES THE ONLY WARRANTY MADE BY OROSYS SAS WITH
RESPECT TO THE PRODUCTS AND IS MADE EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES
EXPRESSED OR IMPLIED.
2 About the Le Preamp
2.1 Introducing the Le Preamp
Two notes is first and foremost a team of music lovers who are all great admirers of musicians. We
are highly qualified engineers, technicians, and musicians, whose purpose is to facilitate the life of
guitar and bass players without infringing on their playing habits. Our mission consists in providing

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them with studio-grade products that are specifically designed for the guitar and bass.
From the moment we launched the Torpedo C.A.B., we believed it was possible to build a high quality
pedalboard to entirely replace a conventional tube amplifier system: the complete floor rig. Even with
an almost limitless choice of available guitar effects, we always felt that finding a very good
preamplifier in a pedal format was challenging. This is why Two notes is proud to premier its line of
tube preamplifiers: Le Clean, Le Crunch, Le Lead and Le Bass.
2.2 The concept
The selection of a preamplifier is the core of your overall tone and thus requires the greatest
attention. When building a complete floor rig, only the very best will make the cut. The Two notes
preamplifiers are a True High Voltage Design running internally at 200 volts to preserve the
interaction between you and your guitar while working perfectly with your other effect pedals. Each of
the four different versions deliver the unique tube warmth, dynamics, and the musical compression
from the amps we know and love, now in a more convenient pedal package. And, of course, you can
use them as an elaborate tube overdrive, in front of your favorite amplifier!
2.3 Two channels plus Fusion mode
The A and B channels are totally independent, each with their own voicing and eq section: Bass and
Treble on A, Bass, Mid with Mid Sweep and Treble for B. On Channel A you will find a lower gain tube
stage with a pre-gain EQ using a more vintage design approach, while Channel B offers more gain and
a very powerful post-EQ (with mid sweep). The exclusive Fusion modes open new horizons.
In “Hot Fusion”, A and B are cascaded, meaning A can be used as a boost for B with both A and B EQ’s
available to shape the result. In “Cold Fusion”, the two channels are in parallel, meaning you can
blend the cleaner sound from A and your more distorted sound in B to gain clarity and articulation.
2.4 Switching
Each preamp features 2 channel footswitches, A and B. Simultaneously pressing A and B will activate
the Fusion mode. Pressing A, B or A and B will also send a specific Midi Program Change command,
that can be used to select a preset on your Midi multi effects and/or Torpedo C.A.B.
In addition, the preamplifier may respond to a Program Change sent from another Midi device
allowing a seamless integration into any pedalboard switching system. Combining several Two notes
preamps on your pedalboard makes things really interesting. Connected via Midi, each preamp will
listen to the others. They can be configured in Multi-channel mode: pressing A on preamp 1 will
bypass preamp 2, like the channels of an amplifier. Alternately, when this mode is off: traditional
on/off switching for all preamps, a preamp can be a boost/overdrive for the one that follows.

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2.5 Le Preamp Sonic Guide
We designed four different preamplifiers, to match the modern needs of the demanding guitar
and bass player.
Le Clean takes its inspiration from the classic amps of southern California in all shades of
brown, black and silver. Channel A has a pure ultra clean texture. Channel B lets you bring in
classic sweet overdrive of a dark desert highway. The Cold Fusion mode gets right to the heart
of Texas while Hot Fusion takes you out of the blue and into the gnarliest Tweed tones.
Le Crunch combines the greatest tones of the classic British stack of amps that have defined
Rock’n’Roll since the late 60’s. Channel A’s clean throaty voice is pure plexi heaven while
Channel B screams move over, let there be rock! The Hot Fusion mode crosses over into the
high gain territory where shredders and down tuned riffers write all the rules.
Le Lead’s Channel A shines on the fusion of a clean to slight crunch tone of a perfect melody.
Kicking in Channel B unleashes the fury of a super tight modern high gain amp, enhanced with
the powerful mid sweep Eq. Hot Fusion takes it all over the top; huge gain, sustain and with the
combined EQ’s, everything from metal to all out fuzz at your fingertips.
With Le Bass, the ultra clean Channel A is perfect for today’s modern techniques with lightning
fast response and a full spectrum of tone. Channel B tips its hat to the foundation of rock bass
with solid punch and a sweet break up available when things get down and dirty. Cold Fusion
lets you live in the limelight with the best of both worlds while Hot Fusion lets you take center
stage with searing bass from a focused distortion to synth-like growls.

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3 Product description
3.1 Side views
You will find in this first table a description of the various inputs and outputs featured in your new Le
Preamp.
< 100% 10% 20% 70% >
1Channel B
footswitch
This footswitch activates the clean Channel B or changes the page/parameter
in MIDI programming. If the Channel A is already selected, pressing a second
time will put your Le Preamp in bypass mode
2 Instrument input Connect a 1/4“ unbalanced shielded cable to your guitar or bass.
3 Thru output
Connect a 1/4” unbalanced shielded cable to feed an amplifier with your
instrument signal. This can be useful on stage of you want to keep an amp as
monitor, or to record the dry signal from the guitar in studio.
4FX Loop Send
output
Plug here a 1/4“ unbalanced shielded cable to send the preamp signal to the
pedals you want to put after the preamp stage. The FX Loop is bypassed when
the Le Preamp is bypassed. In other words, the effects pedal that you put in
this loop won’t be heard when your Le Preamp is bypassed. That is very
interesting in case you have several Le Preamp and you wish to assign specific
effects to each preamp.
5 MIDI input
Connect a MIDI controller (to remotely control your Le Preamp) or another Le
Preamp to this input. Use only a cable featuring a 5-pin DIN connector with all
the pins wired (some cables only have pins 4, 2 and 5 connected). Pin 1 and 3
are used to carry the Multi-channel message.
6Power adapter
connector Plug here your power adapter
7Headphones
output
Plug your headphones and play in the middle of the night without disturbing
anybody! With headphones, and in case you don’t have speaker simulator such
as a Torpedo C.A.B. in the FX loop, we recommend you activate the analog
speaker simulation

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8Speaker
Simulation
This analog speaker simulation is specifically voiced for your Le Preamp Model,
and based on our Torpedo simulator. The simulation is based on our classic Brit
VintC 4×12 picked up with a Dyn57 for the Le Clean, Le Crunch, Le Lead and
on a mix of the vintage Fridge 8×10 and more modern Alu XL 4×10, picked up
with a Cnd87 for Le Bass. This speaker simulation affects the DI output and the
Headphones output.
9 Ground Lift
10 Balanced DI
output
This direct balanced XLR output should be connected to a mixing desk, or a
sound card for a recording. With the speaker simulation on that’s all you need
to achieve a great sound!
11 MIDI output Connect this MIDI output to a MIDI device or another Le Preamp you wish to
control with your preamplifier.
12 FX Loop Return
Input
Plug here an unbalanced 1/4” cable connected to the last pedal you put in the
loop. The FX Loop is bypassed when the Le Preamp is bypassed.
13 Instrument output
Connect this output with a 1/4“ unbalanced shielded cable either to a power
amplifier or a speaker simulator such as the Torpedo C.A.B., or directly into
your digital audio interface for a recording.
14 Channel A
footswitch
This footswitch activates the A “dirty” channel or enter a page in MIDI
programming. If the channel B is already selected, pressing a second time will
put your Le Preamp in bypass mode.
3.2 Front view

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You will find in this table a description of the volume, tone and channel selection options.
1Channel A
footswitch
This footswitch activates the clean Channel A or changes the page/parameter in
MIDI programming. If the Channel A is already selected, pressing a second time
will put your Le Preamp in bypass mode
2Channel A
Input Gain
Determines the amount of gain for your clean tone. Increasing the gain can lead
to more signal distortion, and even unwanted clipping. Adjust that parameter to
your taste, the gain level you will be getting depends on Le Preamp, but also on
your guitar/bass pickups level and the level of other products such as pedals you
may have inserted between your guitar and Le Preamp.
3Channel A EQ
settings
The Channel A features a passive Bass (low frequency) and Treble (high
frequency) voicing section.
4Channel A
volume
Determines the output volume of the channel A, the volume is located pre-FX
Loop. This knob is inactive in Fusion mode. In case you hear unwanted clipping,
try lowering the volume too and make sure the following device in your signal
path is not overdriven.

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5Fusion mode
selector
Pressing the A and B footswitches at the same time will activate the Fusion mode.
The Fusion switch determines if either the Hot Fusion or the Cold Fusion modes
will be activated. Read more about the Fusion modes in the following pages.
6 Fusion Level
In Hot Fusion, this knob determines the level of Channel A that will boost the
Channel B. In Cold Fusion, this knob determines the volume of Channel A that will
be added in parallel to the channel B.
7Channel B
Input Gain
Select the amount of gain for your dirty tone. Increasing the gain will lead to more
distortion of the signal, and even unwanted clipping. Adjust that parameter to
your taste, the gain level you will be getting depends on Le Preamp, but also on
your guitar/bass pickups level and the level of other products such as pedals you
may have inserted between your guitar and Le Preamp. Always keep in mind that
even if we put all our attention on keeping the noise level as low as possible,
increasing the gain can lead to unwanted noises and undesirable feedback.
8Channel B EQ
settings
The channel B features a passive Bass (low frequency) and Treble (high
frequency) voicing section, plus an active Mid (medium frequency) setting with
Sweep. Thanks to the Sweep parameter you will be able to choose the center
frequency of your medium range voicing
9Channel B
volume
Determines the output volume of the channel B. The volume is located pre-FX
Loop. In case you hear unwanted clipping, try lowering the volume too and make
sure the following device in your signal path is not overdriven.
10 Tube window
With Le Preamp, you can see the finely selected tube working! Plus, depending on
the channel, that area will display different colors: Green for Channel A, Yellow for
Channel B, Blue for Cold Fusion mode and Red for Hot Fusion mode. The MIDI
programming features different colors, read more about this in the MIDI section of
this manual
11 Channel B
footswitch
Connect this MIDI output to a MIDI device or another Le Preamp you wish to
control with your preamplifier.
Please note that the bypass mode is important in case you are either using several Le
Preamp in your pedalboard or if you plan to use your Le Preamp as a distortion pedal.
With multiple Le Preamp pedals, connect them in MIDI so the activation of one can defeat
the others (Multi-channel function).
3.3 More on the Fusion modes
By pressing simultaneously the A and B switches, you will enter the Fusion mode. When the Fusion
mode is activated, pressing A and B again will defeat your Le Preamp.
3.3.1 Cold Fusion

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The Cold Fusion puts the Channels A and B in parallel. In other words, you will be able to adjust the
level of Channel A that will be added to the output of Channel B. This technique consisting in adding a
clean signal to a more distorted one is widely used in the studio to regain dynamics and articulation
when the dirty sounds can be too compressed for example. The Fusion knob must be carefully
adjusted and we recommend starting very low on this value and increasing gradually.
3.3.2 Hot Fusion
The Hot Fusion puts the Channels A and B in cascade. In this configuration, the Channel A can be
considered a boost for the channel B, and the Fusion knob determines the amount of boost signal you
send into B.
The gain on the channel A will be very important and it is the addition of this gain and the Fusion
amount that will determine the overall distortion you will get. The channel A features an EQ, and
changing the EQ will play a huge role in the overall tone. If you push the bass your sound will get
more fuzzy, and if you push the treble you will have a more glassy distortion. With these very simple
settings you will discover many tonal options! Always keep in mind that the sweet spot is rarely on
the maximum values, take the time to increase each parameter gradually. Sometimes it’s better to
have the Fusion knob at a lower value and increase the gain on channel A, remember these settings
are very sensitive.
3.4 More on the Mid Sweep
The Mid Sweep is a very powerful tonal option. It can be used either to boost or to attenuate a
medium frequency range. A good way to start with that function is, first, to set your Mid level to the
max, then search for the frequency you want either boost or attenuate by adjusting the SWEEP level.
When you hear that frequency, you can either lower a little the mid level or keep it that way for a
medium boost, or strongly attenuate the frequency by decreasing the Mid level.
4 Connecting the Le Preamp
The Le Preamp can be used in various configurations: as a boost or distortion pedal for your amplifier,
as a preamplifier connected to a power amplifier and cabinets, or in a direct setup for recording,
playing on stage or simply at home with your headphones. The following diagram presents the
various possible connections of the Le Preamp. Please note that this diagram doesn't show all the
wiring possibilities of the product, just the most common ones.

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4.1 What if I want to use several Le Preamp?
You can, in fact, they were specifically designed to work together! Please refer to the following figure.
On this figure you will find, in green, the MIDI connections, and in blue the audio
connections. When connecting several Le Preamp with MIDI for the first time, switching on a preamp
channel will defeat the other preamps. We call it the Multi-channel mode: having more Le Preamp is
like adding channels on an amplifier, and it’s as simple as using a channel footswitch on a traditional
multichannel amplifier. When connecting several Le Preamp with a MIDI cable, make sure you use a
5-pin DIN cable with all the pins wired. Some cables only have pins 4, 2 and 5 connected. Pin 1 and 3
are used to carry the Multi-channel message.

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Regarding the effects position:
Before the first preamp, we put all the effects we may want to apply to any Le Preamp in the1.
chain. It could be a distortion pedal, a compressor, a volume pedal, anything you can put in
front of an amplifier.
In the FX loop of each preamp, we put the effects we want to apply only to one of the2.
preamps. For example, a specific delay we want only on Le Preamp 2.
Finally, after the last preamplifier, we put all the global effects that are usually better3.
sounding after the preamp stage: modulation or reverb effects, a speaker simulator such as the
Torpedo C.A.B., and stereo effects. By placing the stereo effects at the end of the chain, the
next device (mixer, stereo power amp, recorder etc…) can be fed by a stereo signal.
5 Tips & tricks
If you use a Torpedo C.A.B. with your Le Preamp, you may want to put the C.A.B. in the FX loop
of Le Preamp. That way, you can connect the XLR DI output of Le Preamp to the mixer and
listen to the whole system, including the Torpedo C.A.B. simulation, through Le Preamp’s
headphones output.
Even if it’s not shown on the connections diagram, you can use your Le Preamp like a “simple”
tube overdrive/distortion. Just connect it in between your guitar/bass and your amplifier, like
any pedal. If you take the time to carefully set the gain and volume of both channels on the
preamp, you will be able to achieve amazing tones with your Le preamp!
If you are using an overdrive or distortion pedal in front of your Le Preamp, you may want to
lower the Bass level of the Channel A to keep a cleaner signal.
If you choose to add pedals after your Le Preamp, using unbalanced connections, you may want
to put a DI box before sending the signal to a mixer. Especially on stage, adding a DI will help
fighting noise, and protect your last pedal against potential phantom power coming from the
mixer.
Having too much distortion in your tone can lead to a muddy sound that will lack dynamics, and
create or considerably emphasize some unwanted artefacts such as hum, feedback… Ifyou
need a lot of distortion and if the resulting noise is an issue, you may want to consider using a
noise gate processor. Single coil pickups are more sensitive to noise than humbuckers, moving
your guitar around can help you find a noise source (lights, amp’s internal transformer,
computers, monitors…).
In the studio, you can record three different signals coming from Le Preamp at the same time:
The dry guitar signal from the THRU output. This one can be used later for reamping purposes.1.
Le Preamp dry signal from the main output. This one can be processed by the Wall of Sound2.
plugin to achieve the Torpedo speaker simulation.
Le Preamp with analog speaker simulation from the DI output. This one will give a totally3.
different sound and/or mix with the Torpedo simulation to thicken your tone.
Always keep the unbalanced connections as short as possible.
If you want to keep a balanced connection between your Le Preamp and the following device

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connected to its output, you have to use the XLR DI output. If the following device only accepts
1/4”, it is possible to use an XLR to 1/4“ TRS jack cable.
6 The Torpedo Wall of Sound plugin
Wall of Sound (WoS) is a speaker and miking simulation plugin. A plugin is a software you can load on
a track of your sequencer, such as Cubase, Logic, Pro Tools, Reaper, inside your Digital Audio
Workstation. With your Le Preamp, Two notes gives you access to 16 virtual cabinets you can load in
our award winning Wall of Sound plugin. With your Le Preamp and WoS you have the best
configuration to record amazingly good guitar or bass tones for all your musical projects.
To download your 16 cabinets, register your product on the Two notes Audio Engineering website,
download and install the WoS plugin. You will be guided step by step through the process.
Once you have become familiar with the sound and operation of the Wall of Sound plug-in, please feel
welcome to explore the in-app Two notes Boutique which will allow you to audition and have the
option to purchase additional cabinets. You will find more information on WoS on the Two notes Audio
Engineering website.
7 MIDI
7.1 Factory configuration
5 basic functions can be accessed through MIDI Program Changes (PC) sent by an external MIDI
device. The default MIDI receive configuration is the following:
MIDI RECIEVE
Le Preamp Model Channel A Channel B Cold Fusion Hot Fusion Bypass
Le Clean PC 1 PC 2 PC 3 PC 4 PC 5
Le Crunch PC 6 PC 7 PC 8 PC 9 PC 10
Le Lead PC 11 PC 12 PC 13 PC 14 PC 15
Le Bass PC 16 PC 17 PC 18 PC 19 PC 20
In other words, your Le Preamp can receive a MIDI PC asking for bypass or channel switch. Any MIDI
message received will be transmitted to the MIDI output (MIDI Thru function). When using Le Preamp
as a MIDI controller, you will be able to send a MIDI PC to trigger preset changes on another MIDI
device, such as a Torpedo C.A.B. or an FX unit. The default MIDI send configuration is the
following:
MIDI SEND
Le Preamp Model Channel A Channel B Cold Fusion Hot Fusion
Le Clean PC 1 PC 2 PC 3 PC 4
Le Crunch PC 6 PC 7 PC 8 PC 9

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Le Preamp Model Channel A Channel B Cold Fusion Hot Fusion
Le Lead PC 11 PC 12 PC 13 PC 14
Le Bass PC 16 PC 17 PC 18 PC 19
Please note that bypassing a preamp does not send any PC message. The default MIDI channel is
OMNI and the Multi-channel mode is ON.
7.2 MIDI programming
It is possible for the advanced user to change the MIDI configuration of Le Preamp, thanks to the
setup configurator that you can start simply by pressing A while powering on Le Preamp. The
configurator uses your Le Preamp LEDs and tube window color to guide you through the process.
There are 7 pages on the menu and therefore 7 tube window colors.
Page # 1 2 3 4 5 6 7
Function MIDI
Monitor
MIDI
Learn
MIDI
Channel
PC
Number
Multi-channel
mode
Factory
Reset
Firmware
Version
Color White Green Yellow Red Purple Blue Turquoise
You can navigate through the pages using the A switch, and you enter a page using the B
switch. Once you entered a page you cannot go out, you will have to restart the configurator to
access another page. On each page, a modified parameter is instantaneously stored. The storing
process is validated by a fast flashing of the product’s LEDs.
7.3 MIDI Monitor
The MIDI monitor uses the LEDs to display the type of message and the channel used by the emitter.
It is a powerful tool to help you debug a MIDI configuration issue. If you find that the MIDI behavior of
Le Preamp is not what you expected, this short guide will help you fix the issue.
Flash
Color Meaning What to do?
No Light No MIDI Message
received
Control the connection between the MIDI output of your MIDI
controller and the MIDI input of Le Preamp. Control and
eventually change the MIDI cable. Make sure the MIDI controller
is configured to send MIDI messages.
Red MIDI message is not a
PC Make sure your MIDI controller is sending PC messages.
Yellow MIDI message not on
the active MIDI channel
Set your MIDI controller to the same MIDI channel as your
preamp, or set the preamp to OMNI.
Green MIDI message on the
active MIDI channel
Configure your MIDI controller PC so it matches the default Le
Preamp MIDI mapping. Or use the MIDI Learn function on Le
Preamp so the MIDI PC you send triggers one of its functions.

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7.4 MIDI Learn
Your Le Preamp can “learn” how to behave depending on the MIDI message it receives from a MIDI
controller. When entering the MIDI learn page, the tube window is white, indicating the Erase mode.
Function Process Example
Erase a PC
MIDI controller sends a
MIDI PC, this PC will not be
interpreted by Le Preamp
anymore
You want your Le Preamp not to react to PC42 . When the
tube window is white, have your MIDI controller send the
PC42. You can continue with other PC # you want to erase
from memory
Program a
PC
Channel A is selected, the
MIDI controller sends a PC
that is instantaneously
stored
You want the channel Hot Fusion to be triggered by PC84.
Your Le Preamp is in Erase mode (tube window is white) at
first. Click on A+B and make sure the Fusion switch is on
Hot. When your preamp is in the correct state, have the MIDI
device send the PC 84. Several PCs can trigger the same
channel on Le Preamp. If you send several PCs while in this
state, the Hot fusion will be activated for each and every
stored PC. You can continue by attributing other Le Preamp
states (Channel A, B…) to other MIDI PC, simply by selecting
another channel and sending another PC(s) from your MIDI
controller.
7.5 MIDI Channel
This page uses the A and B LEDs flashing to indicate the channel number, OMNI mode or MIDI Off.
OMNI
mode
A and B LEDs are on, that is the factory setting. To go into OMNI mode, just select a
channel over 16
MIDI Off
A and B LEDs are off. In this mode, any MIDI message sent to your Le Preamp will be
sent to the MIDI output without being interpreted. When in OMNI, press A or B once to
enter this mode. Pressing A or B another time will start the Channel Selection process.
Please note the Multi-Channel function remains active (on or off) even when MIDI is off
Channel
Select
A LED flashes to indicate the decade (off or 10) and B the unity (off, 1 to 6). For
example, “14” will be A flashing once followed by B flashing 4 times, “8” will be A off
and B flashing 8 times. After a pause, the flashing sequence is shown again. Press the A
switch to add 10 to the channel number and B to add 1. Going over 16 will bring the
MIDI mode back to OMNI.
7.6 PC number
Your Le Preamp sends a PC every time you press either A, B or A + B. You can select the MIDI PC
number sent by the A switch, that we call “x”. “x” is a number between 1 and 125. The other PCs sent
by the other switches are deducted from “x”, following this rule:
Channel A B Cold Fusion Hot Fusion
PC number x x+1 x+2 x+3
Press the A switch to add 10 to “x” and B to add 1. The PC number is displayed using A and B LEDs
flashing. A indicates the decade and B the unity. For example, A flashing 11 times and B flashing 8

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times means PC118.
7.7 Multi-channel Mode
The Multi-channel mode can be either ON (green tube window) or OFF (LEDs red tube window). Press
A to change this parameter.
7.8 Factory Reset
The factory reset will bring back the Le Preamp MIDI configuration to its initial state. Once you
entered that page, the tube window LEDs will flash in blue. Press simultaneously the A and B switches
to reset your Le Preamp. Once the reset is done, Le Preamp will reboot.
7.9 Firmware version
The firmware version number is displayed using A and B LEDs flashing. A indicates the decade and B
the unity. For example, A staying off and B flashing 3 times means firmware V03.
8 Specifications
8.1 Block Diagram

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8.2 Connectors wiring
8.3 Technical data
Input Jack 6.35 mm (1/4”) unbalanced (TS, Tip/Sleeve) - Impedance : 1 MOhms
Return Jack 6.35mm(1/4“) unbalanced (TS) - Max input level : 17 dBu - Impedance : 2,2
MOhms - Unbuffered, directly connected to Output when active
Output Jack 6.35 mm (1/4”) unbalanced (TS) - Max output level : 11 dBu - Impedance : 300
Ohms
Thru| Jack 6.35 mm (1/4“) unbalanced (TS) - Unbuffered, directly connected to Input
Send Jack 6.35 mm (1/4”) unbalanced (TS) - Max output level : 11 dBu - Impedance : 300
Ohms
DI Output XLR, balanced - Impedance : 600 Ohms balanced, 300 Ohms unbalanced - Max output
level : -7 dBu
Phones Jack 3.5 mm (1/8“) stereo (TRS, Tip/Ring/Sleeve)

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Tube Ruby 12AX7AC5 HG
Tone control
A channel : Passive Bass/Treble tonestack
B channel : Passive Bass/Treble tonestack
Active Mid/Sweep control - Gain : -18 to +6 dB
Freq. (Le Clean, Le Crunch, Le Lead) : 300Hz to 1.5kHz - Freq. (Le Bass) : 220Hz to
1.5kHz
Power Mains power adaptor DC Jack 2.1mm, negative center
Input voltage : 12V DC - Power consumption : approx. 6W - Current draw : 500mA
Dimensions 124 x 189 x 50 (mm) - 4.88 x 7.44 x 1.97 (in)
Weight 750g - 1.65 lb
9 Technical support
Should you encounter a problem with your product or need help regarding any technical aspects,
please note that Two notes Audio Engineering has developed on-line services to provide you with fast
and efficient technical support, the Two notes Help Desk.
Don't hesitate to browse the Knowledgebase, which contains all sorts of useful informations, or submit
a ticket if you have any question or need assistance with a Two notes product.
9.1 Two notes Website
On the Two notes Audio Engineering website, you will find:
news about the company and the products (news on the homepage),
comprehensive information about the Le Preamp and its many applications (FAQ),
firmware and software updates to download (products/Le Preamp/downloads),
access to the Two notes Store where you can buy new cabinets,
the Torpedo BlendIR software (products/Le Preamp/downloads),
an official forum where you can share tips and advice with other Torpedo users (forum).
The Two notes Team often visits specialized forums to help out users.
9.2 E-mail
We do not offer technical support via e-mail. Please contact us via the Help Desk at the address
above.