Specifications
NORD STAGE Eighty Eight V1.1x 6. The Instruments: The Synth section
Page 41
KB T
RACK
The reason for having the Keyboard Track switch is related to basic acoustics. If you raise the pitch of a
waveform, the harmonics naturally raise in frequency. 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 (keyboard tracking) has three modes; “FULL”, “2/3” and “1/3”, which is set with the KB
T
RACK
button. With KB T turned off (both LEDs off), the filter frequency setting is constant regardless
of where on the keyboard you play. When Keyboard Track is activated, the filter frequency setting will be
higher for higher notes as indicated in the illustration below. At “Full” tracking (both LEDs on) the filter
frequency tracks the keyboard 100% (if you turn up the Resonance parameter to full so that the filter self-
oscillates and produces a pitch, Filter Frequency will track to 12 notes/octave). If “2/3” or “1/3” is selected,
the filter frequency/keyboard relationship is more subtle, i.e. the filter frequency will increase less with
higher notes (66% and 33% respectively).
R
ESONANCE
The Resonance parameter is used to further adjust the characteristics of the Filter. Increasing the Resonance
will emphasize frequencies around the set Filter Frequency (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.
F
REQUENCY
C
ONTROL
This knob governs the amount of modulation applied to the Filter Frequency. The Filter Frequency can be
controlled by Velocity or the Mod Envelope. The F
REQ CONTROL
knob controls the modulation Amount
for both modes.
The figure shows how the
Frequency1 value changes
according to where on the
keyboard you play when
KB TRACK
is activat-
ed.
4
The figure shows a 24 dB
lowpass filter with different
resonance amounts (Q-val-
ues).
Q=0.5 represents zero Res-
onance amount and Q=×
maximum amount.