User Manual

Arturia Microbrute User’s Manual 35
The Filter
Filter Modes
This selects among the three filter modes: LP (low-pass), BP (band-pass),
and HP (high-pass). 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.
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.
The filter alters the oscillators’ timbre via the three response modes described
previously (LP, BP, HP). The cutoff can be controlled by the keyboard, the Envelope,
the LFO (via the mod matrix) and the mod wheel. The MicroBrute 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 mode.
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 will start to oscillate on its own. However this
oscillating behavior depends on the cutoff frequency; the MicroBrute filter
oscillates within a range beginning around 350 Hz up to approximately 8 kHz. To extend
the oscillation range, use the Brute Factor knob.