[LP24DB] - 24DB ROLL OFF CURVE
With this button you can switch the rolloff curve of the low-pass filter between 12dB and 24 dB
per octave. The rolloff curve decides how much the frequencies above the cutoff frequency are
attenuated. At 12dB rolloff the over- tones with double the frequency of the cutoff frequency will
be damped down to -12dB (one quarter) of the original level. With a rolloff of 24dB per octave the
overtones would be reduced by 24dB (one sixteenth ) or the previous level at every successive
octave.
<LOWPASS-CUTOFF> - LOW-PASS CUTOFF FREQUENCY
This knob varies the frequency above which the treble is filtered out.
<LOWPASS-RESONANCE> - LOW-PASS RESONANCE
With this parameter you control the characteristics of the filter at the cutoff frequency. High
resonance settings cause an increase of the level in the area of the cutoff frequency. As a result the
filter has a boomy sound characteristic. An extreme resonance setting causes the filter to go into
self-oscillation and create a sine tone, at the cutoff frequency. This is the reason the pitch of this
sine tone can be adjusted with <LOWPASS-CUTOFF>.
<LOWPASS-ENV-MOD> - LOW-PASS FILTER ENVELOPE-SENSITIVITY
This parameter varies the amount by which the envelope generator modifies the LPF cutoff
frequency. When the control is positioned in the middle it has no influence. With negative values,
the greater the deflection of the envelope the lower the cutoff frequency of the filter. (ie. during
the envelope's attack, the LPF closes down more letting less treble through.) With the knob set at
positive values, the cutoff frequency is made higher in proportion to the envelope amplitude, so
the LPF effect becomes much less severe on the peaks.
ENVELOPE-GENERATORS
Envelope generators can automatically modify certain characteristics of your sounds over time. The
severity of their action can be adjusted with these controls. The envelope starts when it is triggered
by the user eg. by playing a key on the keyboard.
The POLYMORPH has four independent envelope generators. Three of these can be controlled
directly on the operating surface. These three envelopes each have four parameters and are placed
under each other in order. The first one controls the cutoff frequency of the High-pass filters, the
middle one the cutoff frequency of the low-pass filter and the third the volume of the sound. The
four adjustable control knobs are the same in their behaviour for each of the three envelope
generators. The fourth envelope is provided for the pitch, and can be found in the oscillator edit
menu.
17
Basics
ENVELOPE-GENERATORS
ATTACK
ATTACK
ATTACK
DECAY
DECAY
DECAY
SUSTAIN
SUSTAIN
SUSTAIN
RELEASE
RELEASE
RELEASE
HP-ENV
LP-ENV
VCA-ENV
ENVELOPE-GENERATORS
