User`s manual

4.2.2 The filter
The filter alters the oscillators’ timbre via the four response
modes described previously (LP, BP, HP & Notch). Its
cutoff and resonance can be adjusted manually. The
cutoff can also be controlled by the keyboard and
modulated by various modulation generators. The
MiniBrute filter is based on Nyle Steiner’s Sallen & Key
architecture (designed in the 70s) and offers
-12dB/octave slopes in LP and HP modes, and
-6dB/octave slopes in BP and Notch modes.
4.2.2.1 Mode
This selects among the four filter modes: LP (low-pass), BP (band-pass),
HP (high-pass), and Notch. The LP mode is the most commonly-used,
and provides sounds which are full/fat and round. The BP and HP modes
provide thinner and harsher sounds. When modulated by the LFO, the
Notch filter mode sounds similar to a phaser effect pedal.
4.2.2.2 Cutoff
This knob adjusts the filter’s cutoff frequency. The frequency range goes
from below 20Hz when turned fully counter-clockwise up to 18kHz when
fully clockwise. For example, in LP mode you can adjust a sound’s
brightness. As an exercise, set all the oscillator mixer slider
potentiometers to 0 (lowest position). Adjust the NOISE generator slider to
midrange, then set all the filter envelope [4.2.2.7] and amplifier envelope [4.2.3.1]
sliders to 0. Move the amplifier envelope SUSTAIN slider to its highest position. Set
the filter mode to LP, turn the ENV Amt knob [4.2.2.4] to 12 o'clock and set KBD
Tracking knob [4.2.2.5] on Off, then press a key and tweak the Cutoff knob as you
listen to the changes in the sound.
4.2.2.3 Resonance
This knob lets you create a resonance peak at the cutoff frequency.
Turning it clockwise emphasizes the partials at the cut-off frequency,
and the sound becomes more aggressive. When the knob reaches its
last quarter zone, the filter starts to oscillate on its own. However this
oscillating behavior depends on the cutoff frequency; the MiniBrute filter oscillates
within a range beginning around 350Hz up to approximately 8kHz. To extend the
oscillation range, use the Brute Factor knob [4.2.8.4].
4.2.2.4 ENV Amt (envelope amount)
Arturia MiniBrute SE User's Manual 32 4 General description