module control attack and decay. The attack con-
trol determines how long it will take for a vol-
tage to reach it's maximum point. The decay con-
trol determines how long it will take for that
voltage to fade away. The resulting signal is
called an 'Envelope'. This envelope may be trig-
gered manually with the trigger pushbutton or set
to repeat automatically with the repeat switch.
If we used the A.D. Generator to control the
Voltage Controlled Amplifier and the Low Frequency
Oscillator to modulate the Voltage Controlled Osc-
illator, the result could sound like a police Si-
ren as it approaches us from a distance, passes us
and moves away.
One other important circuit in the WP-20 is
the White Noise Generator. White noise is a randon
distribution of all frequencies mixed together.
Saying 'SHHHH' through your teeth will produce a
sound similar to white noise. White noise is the
basic ingredient in imitating wind or surf sound.
It can also be added to sounds made by other cir-
cuits. One such sound might be the wind as it
whistles through a screen door.
The number of sounds that can be made with
the WP-20 are almost limitless. Don't be afraid
to experiment with different control settings.
Sometimes, flipping one switch or turning a knob
just slightly will produce a totally new sound.
Once you have a sound just right, mark the con-
trol settings on a patch sheet so that the sound
may be repeated in the future. Don't overlook the
possibilities of using a tape recorder to record
or modify a sound. If your recorder has 'Sound-On-
Sound' you can add different sounds together. Try
recording a sound at one speed and playing it back
faster or slower.
E X P E R I M E N T . . . H A V E F U N
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