Fxpansion BFD2 Manual User Manual download pdf (Page 173)

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Dirty & Clean

The Dirty control sets the amount of post-distortion signal that is heard at the output.

The Clean control sets the amount of the clean signal, which is comprised of the signals ﬁltered out by the low-pass and high-

pass crossovers before the distortion stage. In other words, all the frequencies removed from the signal by the ﬁlters.

It is important to remember that these are not ‘wet’ and ‘dry’ controls – use the standard Mix control at the top of the effect inter-

face in order to mix between the pre- and post-effect signals.

Tone

The Tone control is a simple -6 dB per octave low-pass ﬁlter for the Dirty signal after the distortion stage. It allows you to roll off

harsh high frequencies that may have been generated in the signal as part of the distortion effect.

Bit Crusher

The Bitcrusher effect provides a type of digital distortion that occurs when the sample-rate

and bit-depth of the audio is reduced. It allows you to simulate the sound of early samplers,

useful for underground hip-hop and other ‘lo-ﬁ’ styles.

Bits

This control reduces the bit depth from a maximum of 16 bits to a minimum of 1.82 bits,

which is effectively almost pure digital noise. The noise generated by the bit-reduction proc-

ess is called quantisation noise.

Early digtal drum machines and samplers tended to have 8 or 12 bit resolution.

Freq

This control adjusts the sample rate frequency of the audio processed by the effect. and ranges from a maximum of 100 kHz to a

minimum of 1 Hz.

Lower sample rates result in an aliasing effect on the processed audio.

Drive

This is an OTA-type distortion stage after the crossover ﬁlters, enabling you to add gain and colour to the signal before it is proc-

essed by the bit and sample-rate reduction stages.

LP Freq & HP Freq

These crossover ﬁlters exist before the bit and sample-rate reduction stages, allowing you to dictate which part of the signal is

processed. For example, you can process the high end of a kick drum while leaving the deep low end unchanged.

The low-pass ﬁlters frequencies above the speciﬁed frequency. It has a slope of -6 dB per octave, and ranges from 1Hz to 100

Hz.

The high-pass ﬁlters frequencies above the speciﬁed frequency. It also has a slope of -6 dB per octave, and ranges from 1 kHz to

100 kHz.

These ﬁlters are crossover ﬁlters – the frequencies that are ﬁltered out before the distortion stage are accessible via the Clean

control.

Dirty & Clean

The Dirty control sets the amount of processed signal that is heard at the output.

The Clean control sets the amount of the clean signal, which is comprised of the signals ﬁltered out by the low-pass and high-

pass crossovers before processing. In other words, all the frequencies removed from the signal by the ﬁlters.

It is important to remember that these are not ‘wet’ and ‘dry’ controls – use the standard Mix control at the top of the effect inter-

face in order to mix between the pre- and post-effect signals.

Tone

The Tone control is a simple -6 dB per octave low-pass ﬁlter for the Dirty signal after the bit and sample-rate reduction stages. It

allows you to roll off harsh high frequencies that may have been generated in the signal as part of the processing.

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Fxpansion BFD2 Manual User Manual Page 173

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Fxpansion BFD2 Manual User Manual Page 173

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