Alto A Comp Bedienungsanleitung

24 32 Bit Digital Compressor

Module

User's Manual

LTO

www.alto proaudio.com

Version 1.1 September 2005

English

Comp

ON OFF

SAFETY RELATED SYMBOLS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This symbol, wherever used, alerts

you to the presence of un-insulated

and dangerous voltages within the

product enclosure. These are voltages

that may be sufficient to constitute the

risk of electric shock or death.

WARNING

Describes precautions that should be

observed to prevent the possibility of

death or injury to the user.

WARNING

Power Supply

Describes precautions that should be

observed to prevent damage to the

product.

CAUTION

This symbol, wherever used, alerts

you to important operating and ma-

intenance instructions. Please read.

Protective Ground Terminal

AC mains (Alternating Current)

Hazardous Live Terminal

ON:

OFF:

Denotes the product is turned on.

Denotes the product is turned off.

Disposing of this product should

not be placed in municipal waste

and should be separate collection.

Ensure that the mains source voltage

(AC outlet) matches the voltage rating

of the product. Failure to do so could

result in damage to the product and

External Connection

Do not Remove any Covers

Fuse

To prevent fire and damage to the

product, use only the recommended

fuse type as indicated in this manual.

Do not short-circuit the fuse holder.

Before replacing the fuse, make sure

that the product is OFF and disconnected

from the AC outlet.

Always use proper ready-made insulated

mains cabling (power cord). Failure to do

so could result in shock/death or fire. If

in doubt, seek advice, from a registered

electrician.

Within the product are areas where high

voltages may present. To reduce the risk

of electric shock do not remove any

covers unless the AC mains power cord

is removed.

Covers should be removed by qualified

service personnel only.

No user serviceable parts inside.

Unplug the product before electrical storms

occur and when unused for long periods of

time to reduce the risk of electric shock or

fire.

Protective Ground

Before turning the product ON, make sure

that it is connected to Ground. This is to

prevent the risk of electric shock.

Never cut internal or external Ground wires.

Likewise, never remove Ground wiring

from the Protective Ground Terminal.

possibly the user.

Do not install this product near any direct

heat source.

Do not block areas of ventilation. Failure

to do so could result in fire.

Keep product away from naked flames.

IMPORTANT SAFETY INSTRUCTIONS

Read these instructions

Follow all instructions

Keep these instructions. Do not discard.

Heed all warnings.

Only use attachments/accessories

specified by the manufacturer.

Power Cord and Plug

Do not tamper with the power cord or plug.

These are designed for your safety.

Do not remove Ground connections!

If the plug does not fit your AC outlet seek

advice from a qualified electrician.

Protect the power cord and plug from any

physical stress to avoid risk of electric shock.

Do not place heavy objects on the power

cord. This could cause electric shock or fire.

Cleaning

When required, either blow off dust from

the product or use a dry cloth.

Do not use any solvents such as Benzol

or Alcohol.

For safety, keep product clean and free

from dust.

Servicing

Refer all servicing to qualified service

personnel only.

Do not perform any servicing other than

those instructions contained within the

User's Manual.

Operating Conditions

Always install in accordance with the

manufacturer's instructions.

To avoid the risk of electric shock and

damage, do not subject this product to

any liquid/rain or moisture. Do not use this

product when in close proximity to water.

Preface

Dear Customer,

Thanks for choosing LTO Comp and thanks for choosing one of the

results of

LTO AUDIO TEAM job and researches.

We have been designing professional audio products for a long time in cooperation

with some of the major brands in the world in the audio field.

The LTO line presents unparalleled analogue and digital products made by

Musicians for

Musicians in our R&D Centers in Italy, Netherlands, United Kingdom

and Taiwan. The core

of our digital audio products is a sophisticated DSP (Digital

sound processor) and a large

range of state of the art algorithms which have been

developed by our Software Team for the Last 7 years.

Because we are convinced you are the most important member of LTO AUDIO

TEAM and

the one confirming the quality of our job, we'd like to share with you our

work and our dreams,

Paying attention to your suggestions and your comments.

Following this idea we create our products and we will create the new ones! From

our side,

we guarantee you and we will guarantee you also in future the best quality,

the best fruits

of our continuous researches and the best prices.

Our LTO Comp is the result of many hours of listening and tests involving

common people, area experts, musicians and technicians.

Nothing else to add, but that we would like to thank all the people that made the

LTO

Comp a reality available to our customers, and thank our designers

and all the LTO staff,

there to make possible the realization of products

containing our idea of music and sound

and there to support you , our customers,

in the best way, conscious that you are our best richness.

Thank you very much.

LTO AUDIO TEAM

For our LTO AUDIO TEAM, music and sound are more than a job ....are first of

all passion

and let us say ...our obsession!

The result of this effort is the realization of dynamic process presets ,useful for

complex sound sources as CD or for single instruments sound improvement,

collected and transformed in presets now available in our small (half rack space),

efficient and easy to use LTO Comp.

Table of Contents

1. Introduction ...........................................................................................6

2. Feature List ............................................................................................6

3. Front and Back Panels description .........................................................6

3.1 Control Panel (Front Panel)

a. Program and Variations Selections

b. Analog Levels

c. LED and Illuminated Power Switch

3.2 Analog Connections (Back Panel)

a. Analog Inputs/Outputs

b. Compressor Bypass Pedal Input

c. Power Connector

4. Installation & Connection .......................................................................8

4.1 Power UpAudio Connections and

a. Audio Connections

b. Power Up Setting

4.2 Analog

a. Input Jack Wiring

b. Levels Setting

c. Compression Process Bypass

4.3 Installation

a. Standard Use

b. Application Examples

-Line Instrument

-Mixer

4.4 Rackmount

5. Preset Functions Descriptions ...............................................................12

5.1 Stereo AGC

5.2 Dynamic Compression Process

5.3Stereo 2 Bands Compressor

e. classic 5

f. classic 6

g. classic 7

h. classic 8

5.7 Compression Effects Summary Table

6. Technical Specifications .....................................................................18

6.1 Block Diagram

6.2 Specifications

7 Warranty ...............................................................................................20

a. classic 1

b. classic 2

c. classic 3

d. classic 4

5.6Mono2Bands+5Bands Eq Compressor Presets

5.4 Stereo 2 Bands Compressor Presets

a. agc pure

b. acoustic

c. master

d. clean

e. dance

f. kick drum

g. mixdown

h. jumping up

5.5Mono2Bands+5Bands Eq Compressor

1. Introduction

Purchasing LTO Comp, you purchased a very powerful dynamic processor,

easy to

use and contained in a very efficient half rack package.

LTO Comp is divided in two

groups of 8 compression algorithms and

16 AGC configurations for each of these algorithms.

The first 8 compression algorithms have been designed for a general purpose use

and very powerful when processing "full band" input signals as CD sources or as

final results of mixing sessions. These algorithms are fully stereo algorithms and do

not introduce heavy modifications in sound's colour.

The second 8 algorithms have been designed for the processing of mono signals

and mono sound sources as musical instruments or voice. These algorithms may

change quite heavily the colour and the phase of the input signal, so as the balance

between low and high frequencies of the signal itself.

All the algorithms are based on classical algorithms for the dynamic compression

of audio signals, modified and optimized thanks to the experience of LTO AUDIO

TEAM researchers.

2. Feature List

Robust and Compact design

24/32 bits Digital Audio Processor

MPU Control

Automatic Bypass Switch Detection

16 Great Sounding Programs

Variation Adjust Knob (16 positions)

Analog "Process Bypass" Switch

Variable Input / Output Gain

Stereo/Mono Jack inputs

Illuminated Power Switch

Digital Saturation Led

Up to 9dBu Line Level

Easy to Operate Front Panel Controls

SMT Design for Greater Reliability

Short Signal Path and no Internal Cabling to Provide Superior Sound

Manufactured Under ISO9001 Quality system

3. Front and Back Panels Description

3.1 Control panel (Front Panel)

- Analog Output Level Potentiometer : The output level control sets the level

going to theamplifier or mixer from this apparatus.

- "Process Bypass" Switch: The "Process Bypass switch allows to bypass"the

digital process so to have the input signal available on the outputs.

c. LED and Illuminated Power Switch

- Digital Saturation LED : Displays the signal level coming into the input during

normal operation, if the signal level is too high, this LED will light and you will

begin to hear the signal distortion.

- Power On/Off Switch : Turns the apparatus on and off.

3.2 Analog Connections (Back Panel)

-Analog Input Level Potentiometer : The input level control sets the main input

gain, before

the signal reaches the input bus. It controls both the Left ( Mono)

and Right input levels

simultaneously.

b. Analog Levels

a. Program and Variations Selections

- Program Select Knob: The Program Select Knob is used to choose the program

you wish to perform.

- Variations Select Knob : Each program on this apparatus has the AGC parameter

which can

be adjusted by means of this knob.

a. Analog Inputs/Outputs

- Inputs : These are 1/4" unbalanced phone jacks which connect to sources

such as Channel inserts of a mixing console. They may be used with Line

input For mono application, use the Left / Mono input.levels up to 8/9 dBu.

The Left / Mono input jack is normal to the Right jack. This means that when nothing

is plugged into the Right input jack, the signal present at the Left / Mono input is

routed to the Right as well.

9VAC

POWER

~BYPASS OUTPUT INPUT

LEFT RIGHT LEFT(MONO) RIGHT

SIGNAL OUTPUT

INPUT

24 32 bit Digital Compressor Module

10 0 10

MASTER

MIXDOWN

JUMPING UP

DANCE

CLEAN

KICK DRUM

ACOUSTIC

AGC PURE

VARIATIONS

POWER

CLASSIC 8

CLASSIC 7

CLASSIC 6

CLASSIC 5

CLASSIC 4

CLASSIC 3

CLASSIC 2

CLASSIC 1

Comp

LTO

COMP

BYPASS

ON OFF

Do not place cables where they can be stepped on.

Avoid twisting a cable or having it make sharp right angle turns.

b. Power Up Setting

Before turning on the Comp's power, check if:

All connections have been made correctly.

The volume controls of the amplifier or mixer are turned down.

Insert the Power plug into the [POWER] input on the rear panel of the Comp

Always unplug cables by firmly grasping the body of the plug and pulling directly

outward.

Do not bundle audio cables with AC power cords.

Do not place audio cables and Comp near sources of

electromagnetic

interference such as transformers, monitors, computers, etc.

- Outputs : These are 1/4" unbalanced phone jacks which connect to devices

such as the

channel inserts on a mixing console or power amplifier inputs.

b. Compressor Bypass Pedal Input

- Compressor Bypass : This is a 1/4" phone jack which connects to a footswitch

(with

latching ), either normally-open or normally-closed. When the footswitch

is in the state of

" OFF ", the function will be " Compressor "; On the other hand,

when the footswitch is in the state of " ON ", the function will be " Bypass ".

c. Power Connector

- Power connector : This is a plug for connecting the 9VAC power supply adapter

provided by the manufacturer.

4. Installation & Connection

4.1. Audio Connections and Power Up

a. Audio Connections

Turn on the power of the amplifier/mixer, and adjust the volume.

Turn on the power of the Comp, pushing the ON/OFF button on the front panel.

and plug the power adapter into an AC outlet.

The connections between the Comp and the other audio devices have to be made

using high quality cables so to prevent bad performances of the Comp itself.

So it should be good to use low-capacitance shielded cables with a flexible

internal conductor. Connect the cables to the Comp properly by observing

the following precautions:

4.2. Analog

a. Input Jack Wiring

The Comp's LEFT INPUT jack is also mono input for the Comp. If

you only connect a single mono cable to the LEFT INPUT jack, it will be

through the

Comp unchanged. This can be done in two ways:

by pushing the BYPASS switch

by connecting a footswitch to the BYPASS jack and pressing the footswitch.

On the back panel you will find a footswitch jack labelled BYPASS . This is a mono

jack with

connections for a standard footswitch. The footswitch must be plugged

in before

the Comp has its power turned on: Comp will automatically

recognise

the right "polarity" of the pedal.

4.3 Installation

a. Standard Use

The Comp may be placed almost anywhere on a table, on top of an amp,

next to a mixing console. If it will be on furniture, check the rubber feet provided

b. Levels Setting

Proper setting of the input and output levels is crucial in order to achieve the maximum

signal-

to-noise ratio. It is possible to say that it is usually best to set both input

and output level

controls at 3/4 or 75% of full. This will decrease the possibility

of overload distortion and

keep the amount of background noise to a minimum.

c. Compression Process Bypass

At any time you can bypass the process, there by allowing the direct signal to pass

also routed automatically to the RIGHT INPUT. However , if we are using

stereo input signals, connecting a cable to the RIGHT INPUT jack , the

automatic routing will be avoided and the LEFT INPUT jack will feed only

the LEFT INPUT, and the RIGHT INPUT jack will feed only the RIGHT INPUT.

If the Signal LED on the Comp start lighting, signaling a process saturation,

turn down the Input level or decrease the volume of the source (instrument,

mixer send, etc.). If the Comp's level is causing the mixer or amp to distort,

turn the Output Level down.

to the bottom of the unit. Make sure to place the Comp's power supply away

from other audio equipment that may induce fields, and away from the signal wiring.

It is possible that Comp may pick up noise field generated by other equipment

such as large power amplifiers; in this case, move the Comp until the noise goes

away.

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