Specifications

NN-XT SAMPLER
17 9
The Filter Section
Filters can be used for shaping the character of the sound. The filter in NN-XT is
a multimode filter with six different filter types.
D To activate/deactivate the filter, click the On/Off button in the top
right corner.
When the filter is activated, the button is lit.
Filter mode
To select a filter mode, either click the Mode button in the bottom right corner or
click directly on the desired filter name so that it lights up:
D Notch
The notch filter is used for cutting off frequencies in a narrow frequency
range around the set cutoff frequency, while letting the frequencies below
and above through.
D HP 12
This is a highpass filter with a 12 dB/Octave roll-off slope. A highpass filter
cuts off low frequencies and lets high frequencies pass. That is, frequencies
below the cutoff frequency are cut off and frequencies above it pass
through.
D BP 12
This is a bandpass filter with a 12 dB/Octave roll-off slope. A bandpass filter
could be viewed as the opposite of a notch filter. It cuts off both the high and
the low frequencies, while frequencies in the band range pass through.
D LP 6
This is a lowpass filter with a gentle, 6 dB/Octave slope. A lowpass filter is
the opposite of a highpass filter. It lets the low frequencies through and fil-
ters out the high frequencies. This filter has no Resonance.
D LP 12
This is a lowpass filter with a 12 dB/Octave roll-off slope.
D LP 24
This is a lowpass filter with a fairly steep roll-off slope of 24 dB/Octave.
Filter controls
The following filter controls are available:
D Freq
This is used for setting the filter cutoff frequency. The cutoff frequency deter-
mines the limit above or below which frequencies will be cut off depending
on the selected filter type. In the case of a lowpass filter for example, fre-
quencies below the cutoff frequency will be allowed to pass through, while
frequencies above it will be cut off. The farther to the right you turn the knob,
the higher the cutoff frequency will be.
✪ It is very common to modulate filter frequency with the modulation
envelope, as described on page 180.
D Res
Technically, this knob controls feedback of the output signal from the filter,
back to its input. Acoustically it emphasizes frequencies around the cutoff
frequency. For a lowpass filter for example, increasing Res will make the
sound increasingly more hollow until the sound starts “ringing”. If you set a
high value for the Res parameter and then vary the filter frequency, this will
produce a classic synthesizer filter sweep.
For the notch and bandpass filter types, the Resonance setting instead ad-
justs the width of the band. That is, the higher the resonance setting, the nar-
rower the band will be where frequencies are cut off (notch) or let through
(Bandpass).
D K. Track
This lets you activate and control keyboard tracking of the filter frequency. If
keyboard tracking is activated, the set cutoff frequency of the filter will
change according to the notes you play on your keyboard. That is, if you play
notes higher up on the keyboard, the filter frequency will be raised and vice
versa.
When the knob is set to its center position, filter frequency is adjusted so
that the harmonic content remains constant across the keyboard.
Keyboard tracking is deactivated by default (the knob all the way to the left).
This means that the filter frequency will remain unchanged regardless of
where on the keyboard you play.