Instruction Manual

18.1. AUTO FILTER 238
while the Attack control sets how the envelope responds to rising input signals. Low Attack
values cause a fast response to input levels; high values integrate any changes gradually,
creating a looser, slower response. Think of it as adding inertia to the response.
Lower Release values cause the envelope to respond more quickly to falling input signals.
Higher values extend the envelope's decay.
The Auto Filter also contains a Low Frequency Oscillator to modulate lter frequency in a
periodic fashion. The respective Amount control sets how much the LFO affects the lter.
The Rate control species the LFO speed. It can be set in terms of hertz, or synced to the
project tempo and set in terms of meter subdivisions. The second option allows for creating
controlled rhythmic ltering.
Available LFO waveform shapes are sine (creates smooth modulations with rounded peaks
and valleys), square, triangle, sawtooth up, sawtooth down, and sample and hold (generates
random positive and negative modulation values) in mono and stereo.
There are two LFOs, one for each stereo channel. The Phase and Offset controls dene the
relationship between these two LFOs.
Phase keeps both LFOs at the same frequency, but can set the two LFO waveforms out of
phase with each other, creating stereo movement. Set to 180, the LFO outputs are 180
degrees apart, so that when one LFO reaches its peak, the other is at its minimum.
Spin detunes the two LFO speeds relative to each other. Each stereo channel is modulated
at a different frequency, as determined by the Spin amount.
For sample and hold, the Phase and Spin controls are not relevant and do not affect the
sound. Instead, the Auto Filter offers two kinds of sample and hold: The upper sample and
hold type available in the chooser provides independent random modulation generators for
the left and right channels (stereo), while the lower one modulates both channels with the
same signal (mono).