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DIGITAL RACK MIXER M32R User Manual
dyn
The dyn amics tab displays all aspects of the channel compressor, and allows for
very deep control of the effect. Whereas the top panel’s dedicated compressor
section allows control of the threshold and in/out status, the
dyn
tab offers many
more controls. This tab can be accessed directly by pressing the VIEW button in
the top panel DYNAMICS section.
The
dyn
tab contains the following parameters that can be adjusted using
the six push encoders:
Page 1
1. Adjust the first push encoder to set the input threshold of
the compressor.
2. Tap the first encoder to toggle the compressor in/out of the signal path.
3. Adjust the second encoder to set the ratio of the compressor.
4. Tap the second control to switch the channel dynamics effect between
compression and expansion.
5. Adjust the third encoder to set the attack time of the compressor effect.
6. Tap the third encoder to switch the compressor between Peak and RMS
(root mean squared) mode, where the average level of the signal is
evaluated more than any specific peak of the channel material.
• PEAK : A peak-sensing compressor responds to the instantaneous
level of the peak signal. While providing tighter peak control, peak
sensing might yield very quick changes in gain reduction, more
evident compression, or sometimes even distortion. This mode is
suitable for control/limiting of dynamic material.
• RMS : In this mode, the compressor applies an average function
on the input signal before its level is compared to the threshold.
This allows a more relaxed compression that also more closely
relates to our perception of loudness. Sharp dynamic transients
will be less affected in this mode. This mode is good for controlling
levels in a mix.
7. Turn the fourth encoder to adjust the hold time of the compressor.
• Hold time is a parameter not often found on commercial units,
but is very useful. If a compressor is set to use a very fast attack/
release time, audible distortion can occur, because the compressor
is trying to work on individual waveform cycles of the signal
instead of the sound envelope as a whole. The Hold parameter
works around this issue by providing a short delay. This delay
prevents the compressor from releasing until a certain period of
time has elapsed.
8. Tap the fourth encoder to switch between Linear and Logarithmic
modes for the compressor. Following are some brief descriptions of
those different modes:
LOG
: This mode is used in many well-respected compressors and is the
natural result of more recent analogue units employing logarithmic
side chains and resistor/capacitor time constants. The exponential/
dB law has some interesting characteristics. Firstly the time taken to
complete a compression event tends to stay the same however large
the dynamic signal excursion is. Also, since the peak rate of gain change
increases with dynamic excursion, the resulting harmonic content due
to compress tends to follow the loudness of the signal in a way that
the ear expects. This helps to mask the effect of the compressor and
thus provides the most forgiving solution, being tolerant of differing
timing settings and signal material. This makes it the best choice
for general compression use and overall dynamic control of complex
musical signals.
LINEAR
: In this mode, the rate if gain change is constant (as set by the
timing controls). Therefore the greater the signal dynamic excursion,
the longer the compressor will take to complete a gain change.
Also, since the total time that the compressor spends in attack or decay
is proportional to the size of the gain excursion, the harmonic content
of the compression artefact will seem to reduce in frequency content,
the louder the signal excursion. This type of compressor is useful for
generating dynamic sound effects because the sonic character of the
compressor is much more affected by time control settings and signal
material than the exponential type.
9. Adjust the fifth encoder to set the release time of the compressor.
10. Tap the 5th encoder to engage the “auto” function, which automatically
optimizes advanced parameters such as attack, hold and release.
11. Adjust the sixth encoder to set the makeup gain of the compressor;
useful when the compression effect has reduced the overall signal level
of the channel too much.
Page 2
1. The 1st encoder still engages and adjusts the threshold.
2. Adjust the 2nd encoder to set the mix of the compressor. Normally this
would be set to 100%, but by reducing the mix level, an effect called
‘parallel compression’ can be achieved, allowing some of the signal to
pass through uncompressed.
3. Adjust the third encoder to set the steepness of the compressor knee
angle between five separate settings. Adjust this control to switch
between a harder sounding, or more transparent compressor effect.
4. Tap the third encoder to move the compressor effect before or after the
EQ in the channel signal path.
5. Adjust the fourth encoder to set the frequency of the key filter that can
be used to trigger the compressor.
6. Tap the fourth encoder to toggle the key filter on/off, allowing a specific
frequency to control the compressor.
7. Adjust the fifth encoder to set the steepness of the EQ slope used in
the compressor.
8. Tap the fifth encoder to send the key source to the solo bus, allowing
the key source to be monitored and evaluated.
9. Adjust the sixth encoder to select the specific key source to be used,
Choices include ‘Self’ (the channel’s own signal), as well as any other
input/output of the console.
10. Tap the sixth encoder to assign the selected key source to
the compressor.