Modifying an operator
1.
Select the
Current operator
radio button corresponding to the operator to be modified.
2.
Use the envelope graph to modify the amplitude of the operator over time.
3.
From the
Operator shape
drop-down list, choose a waveform shape.
4.
Specify the frequency of the operator in the
Frequency
box.
Notes:
• If
Frequency
is set to 0.00, a DC (zero-frequency) waveform is produced regardless of the waveform specified.
• When you choose
Filtered Noise
from the
Operator shape
drop-down list,
Frequency
determines the high-frequency content of
the noise.
5.
Use the
Feedback
slider to determine the amount of the operator's output that is used to modulate itself. If the operator is also
being modulated by another waveform, the feedback path and the modulator output are mixed together to modulate the carrier.
6.
Use the
Amplitude
fader to determine the output gain that is applied to the current operator after the amplitude envelope.
Note:
If the operator is a modulator, this control (along with the envelope) determines the amount of frequency modulation applied
to the carrier. If the amplitude of a modulator is high, harsh audio may result.
Generating simple waveforms
The
Simple Synthesis
tool is used to generate simple waveforms of a given shape, pitch, and length.
1.
From the
Insert
menu, choose
Synthesis
, and choose
Simple
from the submenu. The Simple Synthesis dialog appears.
Tip:
You can also click the
Simple Synthesis
button (
) on the Insert toolbar.
2.
From the
Waveform shape
drop-down list, choose a shape to specify the shape of a single period of the current operator’s
waveform.
3.
In the
Length
box, specify the length (in seconds) of the generated waveform.
4.
In the
Start Frequency
box, specify the frequency of the waveform.
5.
If you want to sweep a range of frequencies, select the
End Frequency
check box and specify an ending frequency in the box.
Select the
Log Sweep
check box if you want to sweep the range logarithmically; when the check box is cleared, the sweep is linear.
6.
Use the
Amplitude
fader to set the peak level of the waveform.
Note:
When you choose
Noise
in the
Waveform shape
drop-down list, the amplitude is affected by the specified cutoff frequency.
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CHAPTER 9
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