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Table Of Contents
EFFECTS MENU 575
Overview of am-munition
am-munition is composed of the following sections:
Mode: The basic functionality of the plug-in is determined here. The normal mode is
stereo, meaning the input signal is entered on 2 channels (left and right) to the sidechain
and thereby to the control circuit. In "M/S" mode, however, encoding of the stereo signal
will be carried out in parts as "center" (left and right) and "side" (left-right, differential signal).
After this both parts are sent to the sidechain. The functionality of "M/S" mode is
exceptionally well suited to compression of material from the pop and dance genres, where
bass sources are commonly positioned in the center of the stereo field. Normal
compression in stereo mode will always produce modulation or "pumping", since the bass
drum or the bass line reduces the total volume with its own energy. However, the division
of the signal into center and side information merely makes a stronger modulation in a
different range of the stereo field more noticeable.
Optical compressor: The heart of am-munition is made up of two compressor units which
are indicated by "1" and "2". Depending on mode, you can edit the left and right or the
center and side signals. The compressors are based upon a very detail-oriented modeling
of an optical-electrical circuit. The principle in this case is very simple: The input signal
(sidechain) is used to control a light source. The imitated light hits a photo resistor (LDR, or
light dependent resistor), which produces changes in resistance depending upon changes
in brightness. These in turn directly affect the input resistance of the compressor switching.
One could say that the signal source is its own volume potentiometer. Here the important
factors are system capacity (light source, its controls and applied photo resistance) and so-
called memory effects. Amazingly, circuits based on this principle sound very musical and
open and are well suited for the compression of program material, as long as the
controllers are not supposed to happen too quickly.
Besides controlling the light source to achieve a specific reference line and envelope curve,
am-munition compressors enable the relationship of the input signal to that of the edited
signal to be mixed. Such parallel compression offers far-reaching possibilities for the subtle
compression of signals. As a part of the control circuit is bypassed important transients of