Alesis Air Compressor Alesis Air Compressor User Manual

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Threshold to OFF. Turn on all instruments to be gated but do not pass
program material through them (For example, turn your microphone
on but do not sing through it). Increase the Threshold (clockwise) until
the red CLOSE LED comes on. Any background noise should now be
eliminated.
Example: To remove hiss from a guitar amp signal, set the Threshold
just above the residual hiss while muting the guitar strings. Playing
guitar should produce a signal higher than the threshold, letting
through the notes. When the guitar is not playing, the residual hiss
signal should be below the threshold, closing the gate.
Rate (20 ms to 2 seconds)
When a signal dips below the threshold, Rate determines how long it
takes for the gate to fade smoothly from the gate open to gate closed set-
ting. Shorter settings provide maximum hiss reduction but tend to cre-
ate a "choppier" sound. Longer settings gain a smoother response at the
expense of possibly letting a little hiss come through after the input
signal dips below the threshold.
1.7 FRONT PANEL METERING
The 3630's three meters for each channel indicate several important
parameters.
Gain Reduction Meter (-1 to -30 dB)
This compares the processed and unprocessed sounds, and shows the
amount of gain reduction being applied to the input signal.
Example: A meter reading of -6 dB indicates that the 3630 is attenuating
the input signal by at least 6 dB in order to keep it at the threshold
level. The more lights that are lit, the greater the amount of limiting,
and the more processed the sound.
Input/Output Meter (-30 to +6 dBu)
This monitors the input or output signal, as selected by the
Input/Output switch. This is useful when matching input and output
levels, or to compare the signal level prior to limiting with the signal
level that occurs after limiting.
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