CHAPTER 6
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VOLT PROCESSING
AGC [Automatic Gain Control]
Accelerated Release: Speeds up the AGC recovery time when there’s a big difference between
loud and soft program elements, to prevent “holes” in your dynamic profile.
Activity: Affects ratio, attack time, and release time interactively on wideband AGC. Makes
programming sound like its more tightly controlled.
Texture: Similar to Activity, but on the five separate-band AGCs. It adds a finer level of control.
Gate Threshold: When signal falls below this threshold, GR [Gain Reduction] is frozen at its
most recent level. This stops the AGC from boosting those soft but annoying sounds like talent
breathing or tape hiss. GR is released when signal exceeds the threshold.
RTZ Level: [Return to Zero] Determines idling GR, for when the input is silent. This prevents
the GR from falling to zero, which would cause a sudden burst of loudness when the signal starts
again.
RTZ Speed: Determines how quickly GR will go from previous value to RTZ Level.
Limiter
Hold Threshold Preserves dynamics when sudden peaks are followed by moderate decreases in
level, by temporarily stopping the GR from releasing. The result is a drastic reduction in inter-
modulation distortion as well as a more open sound, even though the audio is still quite dense.
This also works in conjunction with the AGC’s Gate.
Clippers and Final Limiter
Bass Tight Clip: Hard clipper just on the bass notes, to keep them from modulating the main
clipper. Usually most effective on drums.
Bass Girth Clip: More like a musician’s effect; makes upper harmonics of bass notes bigger and
broader.
Final LPF [HD-Pro Only]: Lets you add a sharp cutoff filter to eliminate high frequencies, to
help control distortion with data-reduced media. Filter frequency is switchable to accommodate
different bitrates. LPF setting also changes the frequencies used in its multi-band crossover, to
give you maximum control over program loudness below the desired cutoff.
Sensus [HD-Pro Only]: Omnia’s exclusive Sensus algorithms actually predict how HD, DRM,
DAB, or streaming data reduction will affect your sound. They pre-condition your signal,
making compression sound better—even at low bitrates. Use a lower frequency for low bitrates
and the cleanest voice transmission; choose a higher one to improve the quality of music-centric
programs.
Silk: Adjusts the texture of the main clipper when handling significant mid- and upper mid-
range material such as lead guitar. Actually modifies our distortion-cancelling algorithm: low-
er-numbered settings soften (or silken) the effects of clipping at the expense of a small amount
of perceived loudness.
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