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LM (Low Mid) and HM (High Mid) parametric bands
The Mid bands feature bell curves with adjustable Q.
• Low Mid Band Freq range: 200hz to 2Khz
• High Mid band Freq range: 800hz to 7khz
• Q range: 0.5 octave to 2.5 octave
Each band has its own Power button allowing you to save CPU by only using the bands you need.
Enabling the EQ's SideChain button allows you to EQ the channel's sidechain input. It can be very useful to EQ a SideChain input before it enters a compressor as it may feature excessive energy in a part of the frequency spectrum leading to an undesired compression response. Note that the EQ must be placed before the SideChain-enabled processor in the channel's effect chain.
Frequency Display control
The EQ curve can be adjusted by clicking and dragging the graphical display in the EQ effect interface. To edit a band in this way, move the mouse cursor over the display. The display is divided into 4 zones for each band, each highlighted in a different colour corresponding to that of each band's controls on the interface.
With a band highlighted, click and drag up/down to adjust the band's Gain, and left/right to adjust its Freq. For the two Mid bands, click and drag up/down while holding down the ALT key to adjust the band's Q.
The HP In and LP In buttons are power buttons for each filter – when activated, the filter is enabled, and when deactivated, the filter is bypassed.
4 filter Mode settings are available, each offering different filtering functions relative to the cutoff frequency.
Low-pass mode allows through only frequencies below the cutoff frequency.
High-pass mode allows through only frequencies above the cutoff frequency.
Band-pass mode allows through only a band of frequencies around the cutoff frequency.
This is the opposite of a band pass - it allows through all other frequencies except a band of frequencies around the cutoff frequency.
Modulating a notch filter can give phaser-like results.
The In Drive control sets the amount of signal gain before the filtering stage. As well as increasing the gain, using more drive results in a rich and complex interaction with the filter's resonance due to modelled non-linearities within it.
The Out Drive control adjusts the gain of an OTA-type non-linear amp function at the output, in order to boost and colour the filtered signal.
The Pitch control adjusts the cutoff frequency of the filter. It is measured in semitones.
This control adjusts the resonance of the filter, accentuating the frequencies around the cutoff frequency set by the Pitch control.
High Resonance settings cause the filter to self-oscillate – please exercise caution with your speaker levels when using resonant self-oscillation.
This control changes how quickly the envelope follower section responds to transients in the input signal. Longer Attack times mean that the filter takes a longer time to respond to amplitude changes.
The Release control changes how quickly the envelope follower causes the filter to return to its original position when the input signal decreases after a transient.
The Env Depth control adjusts the amount of modulation of the filter's cutoff frequency by the built-in envelope follower.
The FM Depth control sets the amount of audio-rate modulation of the cutoff frequency by the input.
Enabling the SideChain button results in the channel's SideChain input being used as the source for the FilterMod device's envelope follower and audio-rate FM features. This means other channels can be used to modulate the filter cutoff.
This function allows you to be very creative with the filter – here's a few ideas to try out:
•for quick and dirty LFOs, try tuning a kick down really low and using it as the filter FM source, perhaps after some additional processing such as low-pass filtering
•load arbitrary sounds as user samples using BFD3's sample import functions, and use them as the filter FM source
•try using the TestTone or TestPulse devices as filter FM sources
The Mode control sets the feedback polarity between positive and negative settings.
The Drive control increases the level of the signal entering the comb filter circuit, adding saturation and overdrive.
The Rate control adjusts the speed of the Comb device's built-in sine LFO for modulating the Pitch.
The Depth control adjusts the amount of modulation of the Pitch control with the internal sine LFO.