36 | NORD STAGE 3 USER MANUAL OS V1.X
The M filter is a four pole, 24 dB/octave, resonating low-pass filter. The
character of the filter resonance is one detail that makes it stand out,
leaving more of the low end of the signal than on a traditional 24 dB/
octave low pass filter.
LP/HP
The combined low-pass/high-pass filter (LP/HP) consists of a 12 dB
low-pass and a 12 dB high-pass filter in parallell. The Filter Freq knob
controls the cut-off frequency of the LP filter and the Resonance knob
controls the cut-off frequency for the HP filter.
This combination is highly useful for extensive tonal shaping of any
source, allowing for cutting the range between the two cut-off frequen-
cies or for enhancing a particular range with overlapping filter ranges.
HIGH PASS - HP
If HP (high-pass) is used, frequencies below the Filter Frequency setting
will be attenuated, frequencies above the cutoff will not be affected. In
practice, this means that the sound will become increasingly thinner as
the Filter Frequency is increased.
BAND PASS - BP
The BP (band-pass) filter allows frequencies close the Filter Frequency
setting to pass, while frequencies above and below the cutoff are atten-
uated. This can for instance be used for producing narrow, nasal or very
“controlled” sounds - its exact character depending on filter frequency
and resonance settings.
FILTER FREQUENCY
The morphable filter FREQ knob is used for setting the
cut-off frequency point - that is where in the frequency
range the filter begins to process frequencies. The
actual result of this processing depends on the type of
filter used.
The Image above illustrates three different Filter Frequency settings using
a low pass filter. The area to the left, up to the downward slope indicates
the frequencies that passes through the filter. The area to the right of the
slope are those frequencies that are reduced. Move the slope to the left
and the sound gets duller. The “humps” at the top indicates a resonance
setting.
FILTER RESONANCE
The morphable Resonance (RES) parameter is used to
further adjust the characteristics of the filter. Increas-
ing the Resonance will emphasize frequencies around
the cutoff frequency, making the sound thinner.
Further raising the Resonance will make the sound
resonant to a point where the filter starts to self-oscillate and produce
a ringing pitch. Exactly where in the frequency spectrum this “ringing”
occurs, depends on the Frequency value.
When the LP/HP filter setting is used the RES knob instead controls the
high-pass cut-off frequency, as indicated by the FREQ HP text.
KB TRACK
The reason for controlling keyboard track is related to
basic acoustics. If the pitch of a waveform is raised, the
harmonics naturally raise in frequency as well. If the cutoff
frequency is constant, the sound will be perceived as
getting “muddier” the higher up the keyboard you play. To
avoid this effect, use KB TRACK.
KB TRACK SETTINGS
Off (no LEDs being lit): The filter frequency cut-off point is not altered by
the note played.
1/3: The cut-off frequency will track the keyboard in a 1:3 relationship.
Play one octave higher and the cutoff frequency will move by 1/3 of an
octave.
2/3: The cut-off frequency will track the keyboard in a 2:3 relationship,
play one octave higher and the cutoff frequency will move by 2/3 of an
octave.
1: The cut-off frequency will track the keyboard in a 1:1 relationship.
HP Filter FrequencyLP Filter Frequency
freq
gain
12 dB/Oct
12 dB/Oct
Filter Frequency
freq
gain
24 dB/Oct
Filter Frequency
freq
gain
12 dB/Oct 12 dB/Oct
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