Shelves
EQ fi lter
Tips and patch ideas
• Practice by sculpting a very rich and wide-band
material like white noise.
• Patch a low, constant CV (for example -5V) into the
low-shelf’s (or high-shelf’s) GAIN input to use it as a
high-pass (or low-pass) fi lter
• Sweep and shift the whole EQ curve across the
spectrum by modulating the global FREQ input.
• Strange phase-y sounds can be obtained by setting
the two parametric sections to slightly different
frequencies, then using one for boost and the other
for attenuation. They will largely compensate each
other in terms of gain, but create a phase shift.
• Use Shelves in the feedback loop of an FX proces-
sor, or for subtly balancing a complex patch based
on feedback.
• Control Shelves from a quadrature LFO or Mutable
Instruments’ Frames. With a harmonically rich VCO
as an input signal, this is a good recipe for space-y,
evolving drones!
• A bit of equalization, simulating the body of an
instrument, is sometimes just enough to take a
physical modelling patch out of the uncanny valley.
Modifi cations
A jumper can be installed, or a switch can be wired, on
the 1x3 pin selector available on the back of the module
and labelled -6dB / 0dB. This adds a switchable -6dB
gain on the input signal, giving you more headroom for
extreme boosting.
The two parametric sections are realized with 2-pole
state-variable fi lters. The individual low-pass, band-
pass, and high-pass outputs of these two fi lters are
available on two 1x3 pin connectors.
www.mutable-instruments.net
20hz
500hz
100hz
1khz
10khz 20khz
GAIN
FREQ
GAIN
FREQ
GAIN
FREQ
GAIN
FREQ
Q
Q
0dB
