User Manual

Core Avid Audio Plug-Ins
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Parameter Description
Sample Rate The Sample Rate slider adjusts an audio file’s playback sample rate in fixed intervals from 700
Hz to 33 kHz in sessions with sample rates of 44.1 kHz, 88.2 kHz, or 176.4 kHz; and from 731
Hz to 36 kHz in sessions with sample rates of 48 kHz, 96 kHz, or 192 kHz. Reducing the sample
rate of an audio file has the effect of degrading its audio quality. The lower the sample rate, the
grungier the audio quality
The maximum value of the Sample Rate control is Off (which effectively means bypass).
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The range of the Sample Rate control is slightly different at different session sample rates
because Lo-Fi’s subsampling is calculated by integer ratios of the session sample rate.
Anti-Alias
Filter
The Anti-Alias control works in conjunction with the Sample Rate control. As you reduce the
sample rate, aliasing artifacts are produced in the audio. These produce a characteristically dirty
sound. Lo-Fi’s anti-alias filter has a default setting of 100%, automatically removing all aliasing
artifacts as the sample rate is lowered.
This control is adjustable from 0% to 100%, letting you add precisely the amount of aliasing you
want back into the mix. This slider only has an effect if you have reduced the sample rate with
the Sample Rate control.
Sample Size The Sample Size slider controls the bit resolution of the audio. Like sample rate, bit resolution
affects audio quality and clarity. The lower the bit resolution, the grungier the quality. The range
of this control is from 24 bits to 2 bits.
Quantization Lo-Fi applies quantization to impose the selected bit size on the target audio signal. The type of
quantization performed can also affect the character of an audio signal. Lo-Fi provides you with
a choice of Linear or Adaptive quantization.
Linear Linear quantization abruptly cuts off sample data bits in an effort to fit the audio into the selected
bit resolution. This imparts a characteristically raunchy sound to the audio that becomes more
pronounced as the sample size is reduced. At extreme low bit-resolution settings, linear
quantization will actually cause abrupt cut-offs in the signal itself, similar to gating. Thus, linear
resolution can be used creatively to add random percussive, rhythmic effects to the audio signal
when it falls to lower levels, and a grungy quality as the audio reaches mid-levels.
Adaptive Adaptive quantization reduces bit depth by adapting to changes in level by tracking and shifting
the amplitude range of the signal. This shifting causes the signal to fit into the lower bit range.
The result is a higher apparent bit resolution with a raunchiness that differs from the harsher
quantization scheme used in linear resolution.
Noise
Generator
The Noise slider mixes a percentage of pseudowhite noise into the audio signal. Noise is useful
for adding grit into a signal, especially when you are processing percussive sounds. This noise is
shaped by the envelope of the input signal. The range of this control is from 0 to 100%. When
noise is set to 100%, the original signal and the noise are equal in level.