Marshall Amplification EFFECT PEDAL ED1 COMPRESSOR Owner's Manual page 3

Introduction
Compression is perhaps one of the most useful and versatile
effects available to any guitarist who is interested in improving
their tone.
The purpose of the Compressor pedal is primarily to allow you
to modify the sustain and attack of your guitar sound. Using
classic variable gain techniques the Compressor will provide
masses of clean sustain, which you can utilise whatever your
style. The Compressor pedal senses the level of the incoming
guitar signal and as the signal level decays the gain of the
internal circuitry is boosted to provide extra level and hence
sustain.
The attack control modifies the dynamic response of the guitar
signal (the effect of plucking a string) and allows you to
achieve a range of effects from rounded and mellow to
percussive and funky.
The Compressor also features an Emphasis control which
allows you to assign compression and target the frequencies
you want to compress. This means that you can, for example,
tighten up or compress your bass notes and let your treble
notes ring out.
The Compressor features a passive bypass for the main signal
path to ensure complete tonal integrity and has a quality of
tone matched only by its versatility.
Here follows a complete run down of The Compressor's
features for your information. We have also enclosed a
number of suggested settings to help guide you. It should be
remembered though that these are only suggested settings
and you should really take the time to experiment.
Though the Marshall Compressor can produce traditional type
effects it is also ideally suited to the player who wants
something a little bit different. So take the time to explore the
sonic avenues opened to you by the Compressor, you won't be
disappointed.
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Setting Up
Always use good quality shielded leads.
Always use 9V regulated DC supply with centre negative.
Although it may seem obvious the first action in achieving a
good effected sound (be it duration / compression etc.) is to
find the perfect bypassed sound. This will then allow the
correct level to be set with the effect unit to allow a cut or
boost in volume and a realistic tone.
On clean channels it is advisable to set the gain (or volume)
to a setting of no less than one quarter maximum so as not to
get unrealistic results due to any volume dependent tonal
shaping on the amplifier preamp.
As is inherent in circuits of this type the increase in gain at
low signal levels inevitably leads to unwanted extra noise as
the circuit gain is maximum when the signal level is
minimum. Many players overcome their problem with
discerning use of a swell pedal or simply utilising the bypass
footswitch during performance.
Features
1. Out Jack
This is the output of The Compressor and is for connection
to the amplifier or to another effects pedal.
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