Alesis Air Compressor Alesis Air Compressor User Manual

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1.9 TROUBLESHOOTING
Noisy or "squeezed" sound- Too low a limiting threshold and/or too
high a compression ratio can result in such problems as squeezed, un-
natural sounds or excessive noise. Remember, limiting lowers the in-
put signal's dynamic range. If the input signal has a dynamic range of
60 dB and you apply 15 dB of limiting (quite a lot), the dynamic range
falls to 45 dB. This degrades the signal-to-noise ratio by an equal
amount. A 60 dB signal to noise ratio can be acceptable; a 45 dB signal to
noise ratio is audibly noisy.
If you encounter these types of problems, reduce the Ratio control or
raise the Threshold control. Be careful; because the ear is not particu-
larly sensitive to level changes, it is possible to add considerable
amounts of limiting before it becomes obvious. Monitor the Gain
Reduction meter to see how much limiting is being used, and adjust
Threshold so that fewer LEDs light. Also, compare the bypassed and
processed sounds to hear how much the 3630 affects the sound.
Some musicians use excessive limiting as an effect. Many of the mon-
ster drum sounds you hear in records by artists like Phil Collins and
Peter Gabriel are due to heavy limiting, followed by high-threshold
noise gating to create an abrupt cutoff.
Noisy source signal- A noisy source signal may become more noisy
when processed. Use the 3630's onboard noise gates to quiet a noisy
signal.
Overall noisy operation- If the +4/-10 switch is set to +4, try setting it to
-10.
"Choppy" or "jittery" sound- If the sound is choppy or jittery and the
3630 is in peak mode, increase the Attack and/or Release times. There
are no fixed rules for optimum times since different instruments will
work best with different settings. Generally, low frequency instruments
such as bass will require longer attack times.
Dull attack- The noise gate Threshold must be turned as far counter-
clockwise as possible (with the gate still operating) to catch initial attack
transients. The gate may appear to be working with a wide range of set-
tings, but if the initial transient is being cut off, the signal may sound
dull or lack "life."
Attack and Release controls have no effect- The 3630 must be in Peak
mode for these controls to be active.
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