Yamaha A1R User Manual download pdf (Page 25)

Chapter 7 panel referenCe | 25

LP TB

Low Pass TB is an emulation of the diode ladder ﬁlter from the vintage

Roland TB-303 from 1982. This is a four pole, 24 dB/octave design

but it does not sound anything like the similarly spec’d LP M. The Low

Pass TB has a nice, quirky character to it and will not go into self oscil-

lation like the other low pass ﬁlters, when resonance is turned up high.

Another important feature in this ﬁlter is that a set resonance level will

drop quite a bit if the ﬁlter frequency is lowered.

A band pass ﬁlter lets

frequencies at the

ﬁlter frequency pass,

while frequencies

above and below the

ﬁlter frequency will be

attenuated. The Lead

A1 band pass ﬁlter

has a 12 dB/octave

slope on each side of

the ﬁlter frequency.

A high pass ﬁlter ﬁlter

will attenuate frequen-

cies below the ﬁlter

frequency, frequencies

above the cutoff will

not be affected. The

slope of the high pass

ﬁlter is 24 dB/Oct.

The Nord Lead A1 has a collection of great effects

that can add anything from very subtle to quite

drastic changes to the sound. The Rate/Amount

knob controls rate or amount depending on the

effect used. Turn the knob to "Off" and the effect

will be bypassed.

Flanger

The ﬂanger effect is produced by mixing two identi-

cal signals together, one signal delayed by a small

and gradually changing amount, usually shorter

than 20 milliseconds. The delayed signal is also fed back into the signal

path. This produces a swept comb ﬁlter effect, with a nice swoosh-

ing sound. The ﬂanger in the Nord Lead A1 is modeled after a vintage

MXR™ unit.

Phaser

The phaser effect is created by splitting the audio signal into two paths.

One path passes through a ﬁlter that alters the phase. The amount of

change in phase depends on the frequency. When the signals from the

two paths are mixed together, frequencies that are out of phase will

cancel each other out, creating the phaser’s characteristic notches.

The phaser in the Nord Lead A1 is modeled after a vintage MuTron™

unit.

Ring Modulation is an effect that multiplies an audio signal with another.

In this case the audio signal from the ﬁlter/ampliﬁer will be multiplied

with a sine wave. The frequency of this sine wave is controlled by the

Rate/Amt knob. At low settings you get a tremolo effect, higher settings

will produce some quite drastic harmonic spectra.

Chorus

A Chorus is achieved by taking an audio signal and mixing it with one

or more delayed, pitch-modulated copies of itself. The pitch of the

added copies are modulated by an LFO. This makes the chorus effect

similar to that of a ﬂanger, except that it is created with longer delay

times, giving it a more gentle sound. The output of the Chorus in the

Nord Lead A1 is in stereo.

Ensemble

The Nord Lead A1 Ensemble effect is modeled after a vintage Eminent

organ effect. The very characteristic sound comes from feeding the

audio into three separate, modulated delay lines, that are cross-con-

nected with each other. The output of the Ensemble in the Nord Lead

A1 is in stereo.

Drive

The Drive ampliﬁes the audio signal until it distorts in the same fashion

as an overdriven tube style ampliﬁer. This creates that typical asymmet-

ric soft clipping with the warm-sounding, even-order harmonics that

sounds so nice on almost any sound.

Mutate Sound

Mutate Sound will create an automatic edit of the current, focused

sound. For a more detailed description of the Mutator, please look at

page 15.

Delay

The Delay can add anything from

short, slapback echoes to long, loop

type repeats. Since the delay can be

synchronized to the Master Clock,

it can be a creative component in

rhythmic sounds, together with the

arpeggio and the LFO.

The Delay has 4 feedback levels, a

Dry/Wet control and adjustable tempo.

The Delay tempo can be set manually

or synchronized to the Master Clock

and the repeats can be alternating

between the left and right output.

The Delay features an optional analog

mode that behaves like an "old school" delay when changing the delay

tempo on the ﬂy.

Tempo

The Tempo knob sets the time interval between the repeats. If the

Delay is synchronized to the Master Clock tempo, Tempo will set the

divisions. Range: 20 ms to 1500 ms.

Division Description

2, 4, 8, 16, 32, 64 The straight divisions range from half notes to 64ths.

4d, 8d, 16d The dotted divisions will add an additional half of the

note value. 4d equals one 1/4 and a 1/8th etc...

2t, 4t. 8t, 16t, 32t The t indicates the triplet divisions.

4s, 8s, 16s, The s indicates the swing divisions.

M Divisions are ordered according to their perceived tempo. This is

why the “4d” will be before of “2t”, “4s” is before of “4”, and “4t” is

after “4” etc..

Filter Frequency

freq

gain

12 dB/Oct 12 dB/Oct

Filter Frequency

freq

gain

24 dB/Oct

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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Yamaha A1R User Manual Page 25

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