11—Input and Track Channel Tools
Roland VS-2400CD Owner’s Manual www.RolandUS.com 153
What is Dynamics Processing?
A dynamics processor—as its name suggests—shapes a signal by responding to
changes in its level. It can help you control extreme fluctuations in volume or
exaggerate them by reducing portions of the signal’s level, or “gain.”
The Basic Mechanics of Dynamics Processing
All dynamics processors respond to the same fundamental information:
• A threshold level setting tells the processor to start working when the channel’s
signal is at a particular level.
• An attack setting tells the processor how quickly it should respond when the signal
hits the threshold level.
• A ratio setting tells the processor how much to change the signal’s level.
• A release setting tells the processor when to stop changing the signal’s level.
The VS-2400CD offers the following dynamics processors on the DYN screen.
What’s a Compressor?
A compressor is a device that reduces the difference between the loudest part of a
recording and the softest—what it compresses is the signal’s dynamic range. This can
smooth out volume peaks and can make the signal more manageable.
When a signal’s level exceeds the threshold setting, the compressor lowers the signal’s
gain—the ratio setting determines by just how much. The attack time sets how quickly
the compressor starts reducing the signal’s level after it crosses the threshold, and the
release time determines how long the compressor keeps working before letting the
signal return to its un-processed level.
What’s an Expander?
The DYN screen expander is a downward-type expander that exaggerates the
differences between a signal’s loudest parts and its softest parts—it widens, or
“expands,” the signal’s dynamic range. You can use an expander to make unwanted
background noise quieter. An expander can also make a signal’s original dynamic
changes more exciting by making them more pronounced.
The expander works by bringing down the level of any signal that falls below the
threshold level setting, making the signal even quieter. The ratio setting determines
how much gain reduction will be applied. The speed at which expansion begins is set
by the attack time, and the release time sets how long expansion lasts before the
signal’s allowed to rise back up to its un-processed level.
1. Dynamics Sw
The Dynamics switch—also visible on the CH EDIT VIEW screen—turns the channel’s
dynamics processor on or off.
Compression can also add its own sound to a signal, making it seem tighter and more
professional, since compressors are used so widely on commercial recordings.
An expander can be handy when it’s used as a gating mechanism that makes unwanted
background noise quieter than it is in the original signal.
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