Roland CAKEWALK CA-2A T-Type Leveling Amplifier Guide D'utilisation page 13

• +4. Displays the post-processing output level, referenced to +4 dBm (analog
emulation).
• dBFS. Displays the post-processing output level in the digital domain. This is the true
output meter for digital audio, and is the recommended setting when monitoring output
level.
Note: The output meter of the CA-2A Leveling Amplifier has a different value than the
original hardware it emulates. With analog hardware, 0 dB typically represents the nominal
signal level. Anything above 0 dB is considered "headroom" in the analog domain. Its
clipping or peak level is often around +20 dB, depending on the manufacturer. In this case,
the hardware being emulated has a nominal level of +10 dB and peaks at +16 dB. The
original hardware is analog, therefore the output metering does not conform to the dB-FS
(Decibel-Full Scale) range of a DAW (Digital Audio Workstation) such as SONAR. In order
to keep metering accurate in the digital domain, CA-2A Leveling Amplifier also includes a
dBFS meter option, which accurately depicts the level meter and headroom in the digital
domain.
• Gain. Adjusts the post-compression output level, or make-up gain. Use this control to make
up for the gain lost by the peak reduction. The Gain knob has no affect on the amount of
compression. To adjust the knob in fine increments, hold down the SHIFT key while moving
the knob.
• Peak reduction. Adjusts both the threshold and the amount of compression (gain
reduction). If the input signal level is below the threshold, no compression takes place. Turn
the knob clockwise for more compression, or counter-clockwise for less. To adjust the knob
in fine increments, hold down the SHIFT key while moving the knob.
• R37 (High Frequency Pre-emphasis trim). This control adjusts the gain reduction
frequency response. The original hardware unit was designed for leveling in radio and TV
broadcast applications. Due to an increase in high frequency content in FM broadcasting,
the R37 control adds gain reduction at frequencies above 1kHz, based on the program
material. Use this control to reduce or prevent over-modulation caused by the pre-emphasis
(high-frequency sensitivity). When set to the FLAT position, gain reduction is applied equally
on all frequencies. When the control is moved toward the HF position, gain reduction is
increased on the high frequencies. Experiment to achieve a good balance between low and
high frequency limiting. This control is often useful for de-essing vocals (cut down sibilance
by compressing high frequencies), but the FLAT setting is recommended for most music
applications. To adjust the knob in fine increments, hold down the SHIFT key while moving
the knob.
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