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Working with Effects: Compressor
9.3.1 Compressor
A compressor is used to control the dynamic range of a signal. Using an 'en-
velope detector', the compressor detects the signal level of the input signal.
Then, by automatically reducing the gain when the level of the input signal
is higher (louder) than a certain threshold, the compressor ensures that the
dynamic range of the compressed signal is lower than the dynamic range of
the input signal.
Three different compressor model
PedalPro Ex has three different Compressors model: tubegen, vary-mu and
limiter.
When the Compressor is operating in limiter mode, a hard knee compression
ensures a long sustain, rendering the output dynamic range extremely small.
This mode is great for a long solo sustain and will produce a sound similar to a
MXR dyna comp* compressor, VOX 1903*, or Keeley Compressor*.
When the Compressor is operating in tube compression mode, the soft knee
gently controls the sound peak while the low-medium level sound passes
through. This is great for the rhythm phrase. You can use the Tubegen com-
pressor type to produce a sweet peak control, or the Variable Mu®* com-
pressor for more sustain on the medium volume notes, typical of a Variable
Mu® tube compressor.
The vary-mu compressor type is designed for medium-strong compression –
up to 1:4 - 1:30. The Tubegen compressor type is designed for light-medium
compression 1:3 - 1:22.
PedalPro Ex's compression curves
Compression curve comparison: PedalPro vs Vari Mu*
20
PedalPro
15
Vari Mu tube compressor
10
5
0
-5
-10
-55
-50
-45
-40
-35
-30
-25
Vin [dBm]
*All trademarks are property of their respective owners and used for reference only.
Limiter perfomances: PedalPro vs MXR dyna comp compressor*
30
25
20
15
10
5
0
-20
-15
-10
-5
-60
-55
-50
-45
-40
-35
-30
Vin [dBm]
PARAMETERS
To enter the Compressor configuration page, press the multifunction key
•
[10a] labelled 'Comp' on
The diagram below shows you the screen of the Compressor configuration
page:
Compressor – Compressor effect switch. Range: on (
•
To switch the Compressor on or off and thus add or remove it from your
effects chain, press the BYPASS EFFECT 1 key [10a].
Type – Compressor model. Range: tubegen, vary-mu, limiter
The parameter Type indicates the compressor model used. This can be set
to either 'limiter' to operate in Limiter Mode, or to 'tubegen' or 'vary-mu' to
operate in tube compression mode, with either a sweet peak control ('tube-
gen') or more sustain on the medium volume notes ('vary-mu').
To change the compressor model, press EDIT [5] when in the Compres-
•
sor configuration page, and use the arrow keys [3] until the cursor blinks
under the compressor type name.
Use the selection dial [4] to select between the limiter, tubegen and
•
vary-mu compressors.
Sens – Sensitivity. Range: 0-100%
dyna comp
This parameter sets the desired amount of compression.
PedalPro
To change the value of Sens, press EDIT [5] when in the Compressor con-
•
figuration page, and use the arrow keys [3] to position the blinking cursor
next to the Sens value.
Use the selection dial [4] to set the desired amount of sensitivity.
•
-25
-20
-15
-10
-5
20
page 1
of the main menu.
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