Clavia Nord Modular G2 User Manual page 269

NORD MODULAR G2 V1.4x
This third wave is a special case of the pulse wave, called a square wave, and this has one peculiarity, it only
contains odd number harmonics, which gives it a "hollow" quality.
On many synthesizers (including the Nord Lead) the pulse width can be adjusted, to set the timbre of the
pulse wave. The more narrow the pulse width, the more "thin" the sound will be.
You can also have the pulse width vary continuously, for example from an LFO or envelope. This is
referred to as pulse width modulation. Modulating pulse widths from an LFO creates a rich, chorus-like
effect often used in "string" sounds.
A I
BOUT NHARMONIC
Above we have only discussed spectra where the overtones appear at perfect harmonics. While this is
true for the basic waveforms discussed above, it is definitely not true for all sound. If you for example
use the frequency modulation (FM) or Ring Modulation capabilities in the Nord Modular G2, with two
oscillators set to an "unusual" interval (not octaves or fifths, for example), you will get a spectrum where
the overtones appear at frequencies somewhere between the perfect harmonics. This results in an
inharmonic sound, which often sounds "metallic".
S
YNC
One some instruments (including the Nord Modular G2), two Oscillators can be synchronized. If you for
example synchronize Oscillator 2 to Oscillator 1, Oscillator 2 will start over with a new period of the
waveform, each time Oscillator 1 does so. If Oscillator 2 then has a higher frequency than 1, it will get a
complex waveform that depends both on its own pitch and on that of the other oscillator.
sync-
oscillator
Oscillator
(synchronized)
When sync is applied, the basic pitch of Oscillator 2 is locked to that of Oscillator 1. If you change the
pitch of Oscillator 1 you will affect the basic pitch of both oscillators. Furthermore, when you vary the
S
PECTRA
Amplitude
1 2 3
14. Synthesis basics: The oscillators and waveforms
4 5 6 7 8
Harmonic number
(Frequency)
Page 269