Keeley Compressor Pro. The stomp-box sized compressor/limiter is hand made in Oklahoma, USA and engineered to be an indispensable tool to your musical endeavors. It is in no way limited to be used with only guitar. It has been designed to work as a studio compressor accepting any range of inputs and a frequency response and noise level matching the finest compressors made.
General Compressor Usage
The Keeley Compressor Pro is designed to be used at home or in the studio for creating full sounding recordings of any instrument. In live situations, the Compressor Pro can be used to achieve full sounding, polished performances as well as protect amplifiers and speakers from overload. The Comp Pro is designed to work with any instrument from voice and guitar to keyboard, bass, or drums. Use it when creating a podcast or YouTube videos to maintain professional performance levels. Use it around the home to create tons of sustain while at low volumes or low gain settings!
THRESHOLD, RATIO, ATTACK, RELEASE, GAIN, KNEE, & AUTO
THRESHOLD Control and LED – This is probably the most important control on the Comp Pro. It is adjusted to determine when the compressor is working or when sound is being passed through unaffected. The Threshold control is turned down or CCW until the THRESHOLD LED turns Red as you play your instrument. When the THRESHOLD LED turns Red the Comp Pro is actively compressing your signal. If the LED is Green, the Comp Pro is not compressing and sound is passed through unchanged.
Range of Adjustment is from -50dBu to +10dBu. 2.45mVRMS to 2.45VRMS – Pro Audio (studio) Levels are +4dBu Consumer Audio Levels are -10dBu. Passive guitar or bass pickups are typically about -25dBu to 2.5dBu.
RATIO Control – “the Compression Knob”, Ratio is the amount of compression you set the Comp Pro for. You can set it from No Compression (1:1) when all of the way off or CCW. You can set it as high as Infinite Compression (∞:1) which means that the output level will never increase in output level no matter how loud the input. This type of setting can be used for hard-limiting to protect recording or speakers or in some cases for guitar effects like chicken-pickin’.
ATTACK Control – Attack Times between 0.15ms and 150ms. Controls the time it takes for the Comp Pro to start compressing.
RELEASE Control – Release Times between 0.1s to 3s. Controls the time before the Comp Pro releases or stops compression .
GAIN Control – This is the output level of the compressor. It does not affect the compression controls like THRESHOLD, RATIO, ATTACK or RELEASE. It is for make-up gain if you set for heavy compression gain reduction. +20dB of boost is possible.
KNEE Switch – Hard Knee/Soft Knee. Hard Knee Compression follows a hard fast rule: If THRESHOLD is met, then Compress at this RATIO. Soft Knee is Komfort Kompression. It’s a way to keep compressed guitar or instrument parts sounding lively and dynamic, without the “blanket” of compression found in many types of compressors.
AUTO Switch – OFF/ON – Set to ON in most cases for automatic setting of Attack and Release Times. This will sound natural and work in a very large number of cases. The Comp Pro looks at the input signals like guitar, bass, vocals or drums and determines the correct attack and release times depending on what you’re playing and what signal levels are being detected.
Good Compression Settings
SMOOTHING – Changes in signal level happen when the singer moves away from the microphone or when a guitar player may not use perfect technique in controlling their dynamics, i.e. less than perfect picking hand technique. To smooth changes in dynamics use the Comp Pro for low to medium compression. Set AUTO Switch to ON. Adjust the Compression RATIO Control to 2:1 to 4:1 for example. Set the Gain Reduction LEDS by adjusting the THRESHOLD Control to indicate 3-9 dB of gain reduction on the 7 Segment LED Bar. Adjust GAIN Control if needed. Set KNEE Switch to SOFT. Now play slow and steady chord work, list to how toggling the KNEE switch back and forth Hard/Soft affects your tone and the attack or punch of the notes as well as the release.
SUSTAIN – To add sustain to guitars or keyboards start with a higher Compression RATIO setting for example 10:1 to ∞:1, Set THRESHOLD Control so that THRESHOLD LED turns Red for average level of your guitar or performance, the LED stays red about half the time. You can set the KNEE Switch to HARD or SOFT, SOFT may seem more transparent.
CHICKEN PICKING COMPRESSION – Set RATIO Control to 5:1 to 10:1, a quick RELEASE Time of .5s to 1s. ATTACK Time for quick attack 10-50ms and THRESHOLD Control set to give you 9-12dB of Gain Reduction/Compression on the 7-Segment COMPRESSION LED Array. This will typically give you compression artifacts or effects like a breathing or pumping sound.
BASS BOOM AND SLAP – For a punchy bass guitar sound set the Comp Pro for a medium to high Compression RATIO (6:1 to 10:1) and adjust the THRESHOLD so that the -12dB and sometimes -20dB COMPRESSION LEDs are lit while playing. Set KNEE to Hard mode. That will make the bass punchy and slap a bit harder, reducing boominess. Try Soft KNEE for a a different feel. Set AUTO On.
PREVENT DIGITAL DISTORTION – Set Keeley Compressor Pro as a Hard Limiter by turning RATIO control all of the way up to Infinity to One compression ratio. Set KNEE for Hard. By adjusting the final Gain level to your clipping lights on the digital recorder, you can insure you won’t ruin recordings or get unwanted distortions.
SPEAKER PROTECT (Concerts, Churches, Sound Systems and P.A.s) – You can use the compressor as above as a Hard Limiter. If when playing you hear distortions from your sound reinforcement equipment you can reduce the THRESHOLD, increase RATIO, and reduce GAIN to achieve perfect results. This is where it might be nice to use your Keeley Compressor Pro as the last effect in your signal chain as it can prevent different effects from getting too loud or being added together to drastically increase output volume.
NEVER LEAVE HOME WITHOUT YOUR KEELEY COMP PRO – The Compressor Pro makes the perfect booster or driver for your rig! You can always set the RATIO control for 1:1 compression (otherwise known as No Compression) and use the GAIN to push your amp, pedals, speakers, or other guy out of the way! Once you have learned your new Comp Pro there will never be a reason not to use it.
Compression LED Display – 7 Segment LED display for fast and accurate metering of compression and gain reduction. Gain Reduction Levels of -1dB to -20dB are indicated.
Threshold LED Indicator – Bi-Color LED to indicate when compression is initiated and released.
Exact RMS Analysis (ERA) – Senses the true RMS value of the input program material such as your guitar, bass or drum machine.
Hard/Soft Knee Compression – Hard Compression for limiting or adding sustain, soft knee or Komfort Kompression for gentle compression, keeping performances lively and natural sounding without potential phase issues in parallel, or blending style compression.
Auto Mode – Program dependent Attack and Release times. Set to Auto ON for worry-free performance and automatic Attack and Release times.
True-Bypass – No tone or signal loss when OFF
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Once your return is received by us, your refund will typically be processed within three business days. It typically takes a few business days for all credit card refunds to be processed and reflected on your statement. This means it will take a few extra days for your refund to show in your account after your return is processed. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see the next question.
What if I receive a defective or incorrect item?
If a product is defective upon arrival, or the wrong item was received, we will send you a replacement/the correct item, and all the shipping fees will be covered by us. For defective items, Prymaxe reserves the right to refuse the return if we determine the reason for the unit failing was not covered under the warranty (i.e., if the item was damaged due to user fault or error). If you feel your item was damaged in shipping, please take plenty of pictures of the damaged box and item and immediately contact us so we can open a claim with the shipping company.
Please be very diligent with testing your defective item. Be sure to try other guitars, power supplies, cables, and amps. We also request that you take a video of the item not working. If we receive your item, test it, and find it to be working, we will give you a refund minus the cost of shipping both ways.
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If a defective or incorrect item was sent to you, we will send out the replacement as soon as we get the defective/incorrect item back and approve/process the return (typically within three business days). If we do not have the replacement in stock, we will issue a full refund. If you need the replacement to be sent out immediately, please place a new order, and when we get the defective/incorrect item back, we will issue a full refund of the original order.
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Even if you pre-ordered an item, we must still receive it within 45 days of your order date in order to give you a refund, so please try to only pre-order items you plan to keep. If the pre-ordered item arrives outside of the 45 day window from when you ordered it, you will have 7 days from the arrival date to send it back for store credit (minus original shipping cost) or a replacement.
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There are a number of reasons your package could be refused by us, including: