Sound Parameters – Oscillators
75
Waldorf Q User’s Manual
than
Pulse
,
Alt1
or
Alt2
this parameter does not have any effect The following picture illustrates the
effect of the pulsewidth parameter:
Pulse Width 50%
(Square)
Pulse Width 33%
Pulse Width 25%
Pulse Width <1%
(Impulse)
Picture 16:
Pulse Width parameter results
A pulse width of 50% can be used for flute sounds or very hollow bass sounds.
A pulse width of around 30% can be used for e-piano or fat bass sounds.
A pulse width of around 10% is interesting for Clavinet sounds.
Go experimenting with different startpoints for
Alt1
- and
Alt2
-Waveforms to get a general view
on the supply of Waveforms of both Wavetables.
PWM
-64…+63
PWM
stands for pulsewidth modulation. This parameter determines the amount of modulation that is
applied to the pulsewidth of the oscillator’s square wave. If
Alt1
or
Alt2
is selected,
PWM
determines
the amount of the wavetable modulation. If you select any shape other than
Pulse, Alt1 or Alt2
, this
parameter does not have any effect. The modulation source that affects the pulsewidth is selected by
the source parameter described below.
PWM Source
see Table “Fast Modulation Sources” on page 58
Selects the source of the pulsewidth modulation or the wavetable modulation. Common sources for
pulsewidth modulation are envelopes and LFO, but other sources like the modulation wheel or
aftertouch can create nice effects as well.
To create a thick oscillator sound, use a triangular
LFO
as
PWM Source
with full
PWM
and a
Pulsewidth
of around
80
. This basic setting is useful for very big string and lead sounds. When
you play different notes on the keyboard, you might notice that bass notes sound more detuned
than higher notes. To avoid this behaviour, set
Keytrack
of the used LFO to a positive setting
between
50%
and
100%
.
To create a Bass sound, use a decaying
Envelope
as
PWM Source
with negative
PWM
and a
Pulsewidth
of around
80…127
. This results in a fat attack phase, especially when only one
oscillator is used for the Bass.
When you want to create a sound with a wave sweep, you should roughly set the startpoint
(
Pulsewidth)
onto the desired wave, before you apply any modulation. This helps you to find
the basic waveform where all modulations start from. Note that you can apply unipolar and
bipolar modulation sources . For example, set
Pulsewidth
to 64, which is almost the middle of
the wavetable and apply a slow running LFO to
PWM Source
to sweep through the whole
wavetable.
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