Joranalogue Filter 8

Name: Filter 8
Brand: Joranalogue

8-output multimode filter and 8-phase sine oscillator

12 HP Eurorack module

Filter 8 is a 4-pole cascaded lowpass filter with 8 simultaneous outputs that excels as both a multimode filter and 8-phase sine wave oscillator. Its innovative resonant feedback circuit maintains low frequency response while adding emphasis, and at high resonance becomes a precise VCO with temperature compensation and accurate tracking across 5+ octaves.

Features

8 simultaneous outputs with different filter responses
4 lowpass poles with individual outputs
Pole-mixing for HP, band boost/notch, phase shift, and BP responses
Self-oscillation with 8-phase sine wave generation
Simultaneous exponential and linear FM
Built-in transient generator for filter pings
Hold function for freezing filter state
Temperature compensated VCO tracking
Front panel V/oct and resonance calibration trimmers

Controls & Jacks (36)

COARSE— Sets the base cutoff/resonant frequency of the filter across its full range.
RESONANCE— Controls feedback from filter output, emphasizing filter frequency and enabling self-oscillation
MOD.— Controls the depth of general-purpose modulation applied to the filter.
FINE— Fine-tunes the cutoff frequency for precise pitch adjustment.
LIN. FM— Controls the depth of linear frequency modulation for through-zero FM effects.
EXP. FM— Controls the depth of exponential frequency modulation for musical FM timbres.
V/Oct LED— Indicates signal presence at the V/Oct input.
P1 Out— Phase-shifted output at the first phase angle (45 degrees).
P2 Out— Phase-shifted output at the second phase angle (90 degrees).
COMP.— Selects resonance compensation mode to maintain consistent output level at high Q.
V/Oct— 1V/octave pitch tracking input for playing the filter melodically when self-oscillating.
BP4— Bandpass output at the fourth phase position (180 degrees), centered on the cutoff frequency.
PING— Impulse input for exciting the filter as a resonant percussion source.
Phase 3 Out— Phase-shifted output at the third phase angle (135 degrees).
Signal In— Main audio input to the filter.
180— Indicates activity at the 180-degree phase output.
HOLD— Freezes the filter state, holding its current output as a static voltage.
135— Indicates activity at the 135-degree phase output.
LP1 Out— Low-pass output with a single-pole (6dB/oct) rolloff above the cutoff frequency.
Phase 5 Out— Phase-shifted output at the fifth phase angle (225 degrees).
BP+N Out— Bandpass plus notch combined output, useful for phaser-like timbres.
HP Out— High-pass output that passes frequencies above the cutoff.
AUDIO— Switches between audio-rate and sub-audio modulation behavior for the FM inputs.
EFM— Exponential FM CV input jack for voltage-controlled frequency modulation.
Resonance CV— CV input for voltage control of the filter resonance/Q.
Phase 4 Out— Phase-shifted output at the fourth phase angle (180 degrees).
LFM— Linear FM CV input jack for through-zero frequency modulation.
BIAS— Sets the DC bias point for FM behavior, affecting modulation symmetry.
615— Indicates activity at the 615-degree (equivalent 255-degree) phase output.
660— Indicates activity at the 660-degree (equivalent 300-degree) phase output.
225— Indicates activity at the 225-degree phase output.
90— Indicates activity at the 90-degree phase output.
45— Indicates activity at the 45-degree phase output.
270— Indicates activity at the 270-degree phase output.
Resonance LED— Displays the current resonance level of the filter.
AC Coupling— Enables AC coupling to remove DC offset from the signal path.

How-To Guides

Filter Ping Percussion
8-Phase Sine Wave Oscillator
Resonating Envelopes
Linear FM Bell Tones
Hold Sync Bass
Feedback Drive Distortion
Saw Wave Oscillator
Custom Filter Response Blending
8-Phase LFO Modulation

Explore the interactive Filter 8 panel on BleepDex — tap any control to learn what it does.