11—Input and Track Channel Tools
158 www.Roland.com Roland VS-2000 Owner’s Manual
4. Threshold
The Threshold value sets the signal level at which the dynamics processor
starts applying gain reduction to the signal. It can be set from -24 dB to 0 dB.
The Threshold value in essence sets how much of the signal will be processed:
•
When you’re using a compressor
—setting Threshold to lower values means that more
of the signal will be above the threshold and qualify for gain reduction.
•
When you’re using an expander
—setting Threshold to higher values means that more
of the signal will be below the threshold and qualify for gain reduction.
Threshold and Ratio Settings for a Compressor
While all DYN parameters interact, Threshold and Ratio work together as the two most
important parameters. Here are some guidelines when you’re using a compressor:
•For a signal that has just a few level peaks you want to tame, try a 4:1 Ratio value
with a high Threshold setting so that only the loudest levels are compressed.
•To compress a singer, start with a 2:1 ratio—and a low Threshold value—and
gradually raise the Ratio value to taste.
•To smooth out a bass or tighten a snare, try a middle/low threshold and a 4:1 ratio.
•To add sustain to a lead guitar, try a ratio of 8:1 with a low threshold.
Once you’ve got Threshold and Ratio set, the other DYN settings come into play.
5. AutoGain
AutoGain automatically boosts signals whose levels have been lowered by
dynamics processing so that they peak at -6 dB below 0 dB.
6. Attack
The Attack parameter—which can be set from 0.0 ms (milliseconds) to 800.0
ms—sets the speed at which gain reduction begins when a signal:
• goes above the threshold when you’re using a compressor.
• falls below the threshold level when you’re using an expander.
If you want to make sure your dynamics processor catches even the fastest peaks or
drops in the signal, make the attack fast by setting Attack to a low value. If you’re more
concerned with applying gain reduction to signals that stay above or below the
threshold for longer periods of time—with compression or expansion, respectively—
set Attack to a higher, longer value.
For a: The Threshold parameter determines the signal level:
compressor above which the compressor begins to apply gain reduction.
expander below which the compressor begins to apply gain reduction.
AutoGain sets the signal to a maximum of -6 dB in order to leave a bit of headroom for
fast transient volume peaks that occur before the dynamics processor has a chance to
respond.
Adjust the setting of the Attack parameter to help soften the audible pumping that can
occur with a high Ratio value.
VS2000OMUS.book 158 ページ ２００４年１０月２０日 水曜日 午後３時３分
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