FILTER 8
MULTIMODE FILTER/8-PHASE OSCILLATOR
1
INTRODUCTION
Representing the cutting edge in modular
analogue voltage controlled filter (VCF) design,
Filter 8 offers more possibilities and higher
fidelity in 12 HP than ever before.
Starting from the classic OTA-style 4-pole
cascaded lowpass (LP) topology, Filter 8 features
separate LP outputs, each with their own
character. Additional filter responses are
achieved by pole mixing: 1-pole highpass, a
special band boost and notch response, phase
shifter and 4-pole bandpass. All outputs are
available simultaneously.
Key to Filter 8's performance is the innovative
resonant feedback circuit. By increasing the
resonance, all outputs will resonate at the filter
frequency, without any low frequency response
loss. At higher resonance levels, self-oscillation is
achieved, turning the module into an excellent
8-phase sine wave voltage controlled oscillator
(VCO) with temperature and switchable gain
compensation, low distortion, constant
amplitude and accurate frequency tracking over
at least 5 octaves. At sub-audio frequencies,
Filter 8 can function as an 8-output voltage
controlled slew modifier or 8-phase low
frequency oscillator (LFO).
Simultaneous exponential and linear frequency
modulation is possible, for classic FM tones or
chaotic modulation. A hold feature is also
provided, 'freezing' the output voltages manually
or under gate control. This is useful for halting
modulations, or as a sync-like effect at audio
frequencies. The dedicated ‘ping’ input allows
you to easily create crisp percussive sounds with
different timbres.
While rooted in the legacy of classic synthesisers,
Filter 8 provides a new approach to musical
signal generators and modifiers: instead of
simply a VCF, VCO, slew modifier or VCLFO, a
single analogue module can now be any of those,
and anything in between.
CONTENTS
In the Filter 8 box, you’ll find:
Product card, stating serial number and
production batch.
16-to-10-pin Eurorack power cable.
Mounting hardware: two black M3 x 6 mm
hex screws, two black nylon washers and a
hex key.
The Filter 8 module itself, in a protective
cotton bag.
If any of these items are missing, please contact
your dealer or [email protected].
