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