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STARTING OUT / BASIC SETUP:

• Setting the Threshold:   The Threshold control is, in most cases 
the first control to set on a compressor. Signals that surpass the 
threshold level in volume will be reduced by the factor set on 
the compression control, all signals that don’t meet or exceed 
the threshold level will pass through completely unprocessed. 
To begin set-up, start with gain set at a moderate level, and 
compression set to 1:1. Play music through the pedal noting when 
the threshold indicator changes from green to red. The threshold 
indicator should not stay lit the entire time in most situations. 
For protection against higher than usual peaks, or to use as 
a completely transparent limiter, adjust Threshold to a point 
where the indicator turns red only under the loudest and most 
extreme circumstances, i.e. very hard picking attack, slaps, etc. For 
noticeable compression effects, or “always active” compression 
sounds, adjust Threshold to a level where every note played 
causes the indicator to turn red. 

• Setting the Compression (Ratio) control:   The compression 
control sets the amount of gain reduction that will occur past the 
Threshold level. The ratio, refers to the number of decibels that 
must be introduced over the threshold level to produce a 1db 
increase in output level. So, at a 5:1 ratio, every 5db of increase 
in the level entering the compressor above the set Threshold 
will produce 1db more output. While this sounds like a very 
simple concept, the effects of this can be quite complex. Higher 
compression levels will produce a more noticeable “squish” and 
will limit dynamics. The lower the compression level, the less 

Summary of Contents for GC-2

Page 1: ...Keeley Engineering Bassist and GC 2 Limiting Amplifier Owners Manual ...

Page 2: ...a foot pedal compressor that in many ways can equal the performance of the legendary dbx 160A while consuming incredibly low power and fitting in an unbelievably small package The goal of these pedals is to provide a convenient way of offering real professional quality compression with the kind of accuracy and transparency that studio engineers depend on every day Compression of this kind can be a...

Page 3: ...Knob Use this knob to set the Threshold or trigger point of compression Lower settings will cause compression to occur more often higher levels will require you to play harder before compression begins GAIN Knob Output Level Adjust this knob to increase output level to compensate for compression reduction or to push higher than unity gain or boost Threshold Indicator This is the LED in the center ...

Page 4: ...o a point where the indicator turns red only under the loudest and most extreme circumstances i e very hard picking attack slaps etc For noticeable compression effects or always active compression sounds adjust Threshold to a level where every note played causes the indicator to turn red Setting the Compression Ratio control The compression control sets the amount of gain reduction that will occur...

Page 5: ...er pedals or recording equipment in sequence or to push a quality tube amp in to breaking up It makes a great boost pedal Just give it a shot One word of note about the Gain control If you find yourself pushing the gain quite a bit above midway or zero db in order to get unity gain your threshold is set too low and your compression level may be set too high The more gain that is introduced the mor...

Page 6: ... an active bass to a point where every note played triggered the compressor and it released quickly after the note began to decay COMPRESSION 2 1 5 1 THRESHOLD Dependent on Instrument for ours 30db GAIN 0 to 6db are adaptive to your playing level or the signal input to the compressor Bottom line Attack and Release times vary on program content Attack times are generally speaking about 100 times fa...

Page 7: ...b This setting is for heavy compression and limiting Perfect for lead boosts or country Chicken Pickin One word of note the Threshold setting will depend heavily on the output level of the instrument played so it must be adjusted to taste COMPRESSION 5 1 10 1 THRESHOLD 30db GAIN to taste 0 to 4 db This is aVERY BAD setting At this position you will get constant over compression no dynamics and a s...

Page 8: ...CONTACT US RKFX COM I FX RKFX COM I TOLL FREE 1 8668 GO RKFX ...

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