Knobula Poly Cinematic - Filter Section

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Frequency
Controls the cut-off frequency of the filter."
Env Depth
The amount by which the envelope generator controls the cut-off
frequency."
Low|Notch|High
This switch selects which filter mode to use. Low is a lowpass filter
which attenuates frequencies above the cut-off frequency, this is the
standard go-to type for most sounds. Notch removes frequencies at the
cut-off frequency and has a nasal, phaser like quality ideal for thicker
retro string sounds, and High is a highpass filter that cuts frequencies
below the cut-off frequency, good for thinner glassier type sounds."
Resonance
The Resonance knob controls the feedback through the filter and
accentuates the sound at the cut-off frequency, making sounds more
squelchy. Use carefully as it can self-oscillate at higher settings."
Key Follow
This adjusts the cut-off frequency using the pitch of the note. At the off
position the filter cut-off frequency is always the same no matter which
note is playing, half increases the frequency of the filter with 50% of the
pitch value and full tracks the filter frequency precisely against pitch, so
higher pitched sounds are brighter and fully resonant sounds can be
'played' as a tune.
Filter Section
Each Poly cinematic voice contains a 12db/octave multimode
resonant filter.