Rocktron HUSH User manual

May be covered by one or more of the following: U.S. Patents #4538297, 4647876, 4696044, 4745309,
4881047, 4893099, 5124657, 5263091, 5268527, 5319713, 5333201, 5402498 and 5493617.
Other patents pending. Foreign patents pending.
HUSH®is a registered trade mark of GHS Corporation USA

Your HUSH The Pedal has been tested and complies with the following Standards and
DirectivesassetforthbytheEuropeanUnion:
Council Directive(s): 89/336/EEC ElectromagneticCompatibility
Standard(s): EN55013, EN50082-1
Thismeansthatthisproducthasbeendesignedtomeetstringentguidelinesonhow
much RF energy it can emit, and that it should be immune from other sources of
interferencewhenproperlyused.Improperuseofthisequipmentcouldresultin
increasedRFemissions,whichmayormaynotinterferewithotherelectronicproducts.
To insure against this possibility, always use good shielded cables for all audio input
andoutputconnections.ThiswillhelpinsurecompliancewiththeDirective(s).
Copyright © 2002 GHS Corporation
AllRightsReserved.

NOTE: IT IS VERY IMPORTANT THAT YOU READ THIS SECTION TO
PROVIDE YEARS OF TROUBLE FREE USE. THIS UNIT REQUIRES
CAREFULHANDLING:
Precautions
Read all instructions contained in this manual.
Keeptheseinstructions
Heedallwarnings
Followallinstructions.
Do not use this apparatus near water.
Cleanwithdrycloth
Do not block any ventilation openings (if applicable). Install in accordance with the
manufacturer’sinstructions.
Do not install near any heat sources such as radiators, heat registers, stoves or other
apparatus(includingamplifiers)thatproduceheat.
This product is not equipped with a plug, cable or adapter. A battery provides power
under normal operation. A 9Volt DC adapter may be used to supply power to this unit.
If an adapter is used take care to use an approved adapter and follow the instructions
providedwiththeadapter.
Protecttheadaptercordfrombeingwalkedonorpinched.
Onlyusedattachments/accessoriesspecifiedbythemanufacturer.
Do not use this product with any case, stand tripod, bracket or table that is not
specified by the manufacturer. Insure that the case, stand, tripod, bracket etc. is
properly adjusted and setup (follow all instructions). Extra care and caution should be
taken to avoid tip over and injury.
Unplugthisapparatusduringlighteningstormsorwhenunusedduringlongperiodsof
time.

PrecautionsContinued....
Referallservicetoqualifiedservicepersonnel. Servicingisrequiredwhenthe
apparatus has been damaged in any way, such as power supply or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus or if the apparatus has
beenexposedtorainormoisture,doesnotoperatenormallyorhasbeendropped.
DO NOT ATTEMPT TO SERVICE THIS EQUIPMENT. THIS EQUIPMENT
SHOULD BE SERVICED BY QUALIFIED PERSONNEL ONLY. DO NOT MAKE
ANY INTERNAL ADJUSTMENTS OR ADDITIONS TO THIS EQUIPMENT AT
ANY TIME OR TAMPER WITH INTERNAL ELECTRONIC COMPONENTS AT
ANY TIME. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY VOID THE
WARRANTY OF THIS EUQIPMENT AS WELL AS CAUSEING A SHOCK
HAZARD.
OPERATING TEMPERATURE
Do not expose this unit to excessive heat. This unit is designed to operate between 32
F and 104 F (0 C and 40 C). This unit may not function properly under extreme
temperatures.

Introduction
Congratulations on your purchase of Rocktron’s HUSH®
The Pedal - guitar noise reduction footswitch! HUSH The
Pedal is designed to eliminate the background noise or “hiss”
produced by high gain amplifiers when a signal is present
without descimating your tone.
HUSH The Pedal incorporates the latest version of the
HUSH descreet circuitry which also includes Rocktron’s
patented Variable Integrated Release (V.I.R.) technology.
V.I.R. technology utilizes a low-noise VCA with precision
detector circuits to achieve the smoothest and most transpar-
ent noise reduction possible.
The Pedal is housed in an ultra-rugged chassis with a
slightly recessed Threshold control to protect against any
accidental bumps which might alter your setting.
This user's manual will introduce you to The Pedal and
its various functions. After reading it carefully, please keep it
for future reference.

HUSH
In most applications, the signal from an instrument being played is
much louder than the noise level. Therefore, much of the noise is not heard
when an instrument is being played. However, when you stop playing or let
a note decay, the instrument level drops below the noise level and the noise
becomes much more audible. Setting the THRESHOLD controls just above
the level of the noise causes The Pedal to begin to decrease the output level
so that the noise is never heard.
The Pedal incorporates the latest advancements in HUSH noise
reduction technology. HUSH The Pedal's discreet threshold control
circuit utilizes a voltage-controlled amplifier (VCA) as a downward
expander which can control the gain between the input and output of The
Pedal from unity to over 60dB of gain reduction. When the input signal
is above the threshold level set by the THRESHOLD control, the VCA
will remain at unity gain (i.e. the output level will remain equal to the
input level). As the amplitude drops below the threshold point, down-
ward expansion will begin. When downward expansion begins, the VCA
acts like an electronic volume control and gradually begins decreasing
the output signal relative to the input signal. For example, if the input
signal were to drop below the threshold point by 10dB, the output would
drop approximately 12dB. As the input signal drops further below the
threshold point, downward expansion increases exponentially. This
means that if the input signal dropped 20dB below the threshold point,
the output level would drop approximately 30dB. A 30dB drop below
the threshold would result in a drop of 60dB of the output signal (30dB
of gain reduction). The absence of any input signal will result in the
expander reducing the gain so that the noise floor is inaudible.

The Variable Integrated Release (V.I.R.) technology contained in
each HUSH circuit automatically adjusts the release rate of the expander
based on the dynamic decay rate of the incoming signal. If the input
signal stops suddenly, downward expansion will occur rapidly (similar to
a gate). If the input signal decays slowly, expansion will occur slowly
without disrupting the dynamic decay of the input signal.
The THRESHOLD control should be adjusted by listening to the
noise floor while not playing. Turn the THRESHOLD control clockwise
to the point where the noise floor becomes inaudible. Turning too far
past this point will cause the downward expander to attenuate the output
level too quickly and not allow the signal to decay as long as it should.

1
4
5
2
3
678
Right Side Left Side
Functions
1=
2=
3=
4=
5=
6=
7=
8=
This switch activates the HUSH circuitry. Step on the switch
again to deactivate the HUSH.
Threshold Control - Turn Clockwise to increase the amount of
HUSH added to the signal. In high gain situations turn the
Threshold more towards “Max”. In lower gain settings turn
Theshold more towards “MIN”. Set this control to suit your
taste.
“ACTIVE” LED - When lit the HUSH is “active” or “on”
9 Volt DC Adapter Input
Input Jack
Output Jack
Battery Compartment - To access, remove two screws, pull
cloth tab to remove the battery. When installing a new battery,
push battery in over cloth tab so that you can pull out the
battery during your next replacement.
Battery Compartment screws - remove to access battery.

When using the HUSH The Pedal in line between
your guitar effects and amplifier the pedal should always
be the last device in the signal chain.
The HUSH The Pedal can also be used in your
amplifier’s effects loop. However, if you are running
multiple effects though this loop the HUSH The Pedal
should always be the last dynamic device in the signal
chain, but before digital delays or reverbs.
Connections
StompBoxes:
RampageDistortion, TsunamiChorus, AustinGoldOverdrive,
VertigoVibeRotatingVibe Pedal, HUSH The Pedal
Foot Controllers:
MIDI Mate (Midi Foot Controller)
MIDI I.T. (MIDI Footcontroller)
AllAccess(MidiFoot Controller
RMM900(7-pin Din MIDI Cable)
RFS1 and RFS2 (Single and Double Latching Footswitchs for Rampage Amps)
Continued........
Check out some of our other products:

other products continued..................:
Rack Gear:
Gainiac (preamp w/12ax7 tube)
Chameleon 2000 (preamp w/multi-effects)
Voodu Valve (preamp w/12ax7 tube and multi-effects)
Prophesy (our top of the line preamp with multi-effects)
Intellifex On Line (Multi-effects processor)
HUSH Super C (guitar noise silencing system)
Vendetta VP4 Preamp (All Tube 4-Channel Guitar preamp - 2 Rack Space)
ElectricGuitar -Acoustic Guitar andBass Amplifiers:
Vendetta Head(100 W Head 4-Channels All Tube - MIDI Switchable)
Vendetta Combo (100W 2x12 Combo Celestion 90s all Tube4-Channel MIDI
Switchable)
R80DSP (80W 1x12 Amp w/Digital Effects)
RT80 (80W 1x12 Amp w/Reverb & Built-in Tuner)
R120DSP (120W 2x10 Amp w/Digital Effects)
R120C (120W 2x12 Amp w/Stereo Chorus and Reverb)
RT122C (120W 2x12 Amp w/Stereo Chorus, Reverb & Chromatic Tuner)
R50DSP (50 Watt 2x8"Guitar Amp w/Digital Effects)
R50C (50 Watt 2x8"Guitar Amp w/Reverb & Chorus)
R20 (20 Watt 1x8"Amp w/Reverb)
R10 (10 Watt 1x6.5")
ACOUSTIC (60 Watt Acoustic Amp with Chorus & Reverb)
RA50DSP (50W Acoustic Amp w/Digital Effects - Wedge Shape)
RA30DSP (30W Acoustic Amp w/Digital Effects - Wedge Shape)
RB20 (Bass Amp 20W with 8" Speaker)
RB30 (Basss Amp 30W with 10" Speaker)
RB60 (Bass Amp 60W with 12" Speaker)
RB100 (Basss Amp 100W with 15" Speaker)

Specifications
Input Impedance
Maximum Input
Maximum Output
Distortion
Dynamic Range
Frequency Response
Noise Reduction
Current Consumption
Power Requirement
470K
+5dBu
+5dBu
.09% 0dBu@1KHz typical
99dBu (A-weighted)
±½dB 20Hz-20KHz
over 60dB
10mA
9V battery or 9V DC adaptor

Rocktron -A Division of GHS Corporation
2813 Wilber Avenue
Battle Creek MI 49015
USA
Rocktron Phone: [phone]
Email: [email protected]
2002-0001
Rev. 1/03/02
Check us out on the web at:
www.rocktron.com