Yamaha A1R User Manual download pdf (Page 24)

24 | nord lead a1 User ManUal v1.3x

Filter

The Filter is one of the most impor-

tant components to create the overall

timbre of the sound. The harmonic

content that the oscillators produce

can be shaped with the ﬁlter and the

ﬁlter frequency can be modulated with

several functions. The Nord Lead A1

features a selection of traditional syn-

thesizer low pass, band pass and high

pass ﬁlters and two unique emulations

of ﬁlters from two vintage synthesizers,

the Low pass M and the Low pass TB.

M The two vintage ﬁlters are not just

an emulation of their characters, we have modeled the resonance,

the internal distortion and the envelope characteristics of the

original units as well.

The six ﬁlters share the ﬁlter parameters: Freq controls the cutoff

frequency, Resonance controls the ﬁlter resonance. Drive adds some

overdrive distortion inside the actual ﬁlter and the Modulation Envelope

Amount allows you to control how much the ﬁlter would be shaped by

the Modulation Envelope.

Filter Frequency (Freq)

Filter Frequency is used for setting the cutoff frequency point - where in

the frequency range the ﬁlter begins to attenuate frequencies. Range:

14 Hz - 35 kHz.

The Image illus-

trates three different

Filter Frequency

settings using a

low pass ﬁlter. The

area to the right

of the sloping line

represents the part

of the sound that is

ﬁltered out.

Filter Resonance

Filter Resonance is used to emphasize frequencies around the Filter

Frequency. If you are using a low pass ﬁlter, increasing resonance will

emphasize frequencies around the set Filter Frequency and de-empha-

size the rest of the frequency spectrum.

Further raising the Filter Resonance will make the sound resonant to a

point where the ﬁlter adds a ringing quality to the sound. Some of the

ﬁlters will even start to oscillate at high resonance settings.

LFO Amount

LFO Amt controls the amount of ﬁlter frequency modulation from the

LFO.

Modulation Envelope Amount

Mod Env Amt controls the amount of ﬁlter frequency modulation from

the Modulation Envelope.

Keyboard Tracking (KB Track)

Keyboard Track-

ing allows the ﬁlter

frequency to track the

pitch of the keyboard.

This is related to basic

acoustics; if you raise

the pitch of a wave-

form, the amplitude

of the high harmonics

will also increase. If the

ﬁlter cutoff frequency is

nontracking, the sound

will be perceived as

getting less bright the

higher up the key-

board you play.

•With KB Track off,

the Filter Frequency

cutoff is not con-

trolled from the note you play.

•With KB Track at the 1/3 setting, the cutoff 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.

•With KB Track at the 2/3 setting, the cutoff 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.

• With KB Track at the maximum setting of 1, the cutoff frequency will

track the keyboard in a 1:1 relationship.

Drive

Drive adds a distortion after the ﬁlter with a range

that spans from gentle to quite rude. The Drive On

LED will be lit when Drive is enabled.

 Try the drive with high ﬁlter resonance settings.

Filter Type

Select one of the six available ﬁlter types.

LP 12, 24

A low pass

ﬁlter attenuates

frequencies above

the ﬁlter frequency

setting. The num-

ber indicates the

slope, how steep

the ﬁlter would

become above the

ﬁlter frequency. A

24 dB/octave ﬁlter

has a steeper slope than a 12 dB/octave.

LP M

Low Pass M is a emulation of an original transistor ﬁlter from the

famous Mini. This ground breaking and much loved ﬁlter design was

created and patented in the 1960’s by Dr Robert A. Moog.

The Low Pass M is a four pole, 24 dB/octave, resonating low pass ﬁl-

ter. The resonance on the Low Pass M 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. We have not only analyzed the frequency

characteristics and the resonance, but the internal distortion and the

envelope response (for both ﬁlter and amp envelopes) as well.

ﬁlter frequency

freq

gain

freq

gain

1:1 Tracking

freq

gain

2/3 Tracking

Filter Frequency

12 dB/Oct

24 dB/Oct

freq

gain

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 39 40

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Yamaha A1R User Manual Page 24

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