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Filter
COBALT8M has a wide selection of 31 different filter types to tastefully tailor the sonic content
of the algorithms mix.
• Cutoff: This parameter controls the filter cutoff frequency. This affects the cutoff
frequency of the filter, from 0Hz up to 22kHz.
• Reso: This parameter controls the amount of resonance of the filter.
• Morph: This encoder changes the frequency response of the filter. See below for how
this control morphs each of the different filter types. In any static filter types the ‘Morph’
encoder is used to control filter drive.
• Type: Holding the ‘Patch/Seq’ button and turning the Cutoff encoder selects the current
type of the filter. There are 31 filter types in total, including morphable and static filters.
• Cutoff Scaling: This Parameter switches the control curve of the Cutoff as well as the
Note > Cutoff behaviour of the filter
Legacy - The original cutoff control scaling curve and note-to-cutoff tracking behaviour
from firmware prior to version 2.0.
Relative - A scaling curve that is more balanced and changes the note-to-cutoff tracking
to behave more closely to analogue synths and tracks portamento / glide and pitch bend.
In this mode note-to-cutoff tracks best when the cutoff control is at 0.
Bipolar - The same cutoff control scaling curve as the ‘Relative’ mode, except in this
mode note-to-cutoff tracks best when the cutoff control is at 64.
Morphable Types:
Resonant Low Pass - Morphs 4-pole lowpass, through bandpass, to 1-pole lowpass
The Resonant Low Pass filter type is designed to maximise resonance response.
Balanced Low Pass - Morphs 4-pole lowpass, through bandpass, to 1-pole lowpass
The Balanced Filter types lose less low end frequencies at high resonance settings,
with the trade off that resonance is reduced when sweeping the cutoff towards lower
frequencies.
Balanced High Pass - Morphs 4-pole highpass, through notch, to 1-pole highpass
Balanced Phase - Morph controls the width and depth of the dual notches
State Variable BP - Morphs 2-pole lowpass, through bandpass, to high pass
State Variable Notch - Morphs 2-pole lowpass, through notch, to high pass
Filter
Static Types:
• 4 pole Lowpass Ladder (with drive)
• 3 pole Lowpass Ladder (with drive)
• 2 pole Lowpass Ladder (with drive)
• 1 pole Lowpass Ladder (with drive)
• 4 pole Highpass Ladder (with drive)
• 3 pole Highpass Ladder (with drive)
• 2 pole Highpass Ladder (with drive)
• 1 pole Highpass Ladder (with drive)
• 4 pole bandpass Ladder (12dB Lp /12dB Hp) (with drive)
• 2 pole Bandpass Ladder (6dB Lp / 6dB Hp) (with drive)
• 3 pole Bandpass Ladder (6dB Lp / 12dB Hp) (with drive)
• 3 pole Bandpass Ladder (12dB Lp / 6dB Hp) (with drive)
• 4 pole Bandpass Ladder (6dB Lp / 18dB Hp) (with drive)
• 4 pole Bandpass Ladder (18dB Lp / 6dB Hp) (with drive)
• Notch Ladder (with drive)
• Notch Ladder Alt (with drive)
• Lowpass Ladder with Notch (with drive)
• Lowpass Ladder with Notch Alt (with drive) - notch closes with resonance
• Lowpass Ladder with Notch and Resonance (with drive)
• Bandpass Ladder with Notch (with drive) - notch closes with resonance
• Bandpass Ladder with Notch and Resonance (with drive)
• Phaser Ladder (with drive)
• Highpass Ladder with Notch (with drive) - notch closes with resonance
• Highpass Ladder with Notch and Resonance (with drive)
• Peaking Filter (with drive)
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