How Does It Work?#

OBH-MULTI is a SEM-style state-variable filter that generates lowpass, highpass, bandpass, and notch outputs at the same time from one shared filter core.

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Quick Overview#

• OBH-MULTI is a multi-output analog-style filter.
• One audio input feeds a shared state-variable core.
• It provides simultaneous LP, HP, BP, and Notch outputs.
• The cutoff range is 20 Hz to 20000 Hz.
• Resonance ranges from 0.5 to 10.

Inputs And Outputs#

Port	Type	What It Does
In	Audio	Source signal sent into the filter core.
Cut	CV	Modulates cutoff frequency.
Res	CV	Modulates resonance (Q).
LP	Audio	Lowpass output.
HP	Audio	Highpass output.
BP	Audio	Bandpass output.
Notch	Audio	Bandstop output.

Controls Reference#

Control	Range	Default	Behavior
Cutoff	20..20000 Hz	20000 Hz	Sets the main filter frequency.
Q	0.5..10	1	Sets resonance and narrows the filter response.

Simultaneous Outputs#

• LP is the smoothed low-frequency output.
• HP removes the low-frequency portion and keeps the upper band.
• BP isolates a resonant band around the cutoff.
• Notch removes the resonant band and leaves lows plus highs.

CV Behavior#

• Cut uses exponential modulation.
• Res uses linear modulation and is clamped to the 0.5..10 range.
• Because all four outputs come from the same core, changing one control updates every output at once.

Character Notes#

• This is the most flexible filter in the set when you want several responses at the same time.
• It is well suited to patches that split one sound into multiple tonal layers.
• The notch output is especially useful when you want movement without fully removing either side of the spectrum.