G. CONTROLLERS
This section will demonstrate the use of the controls located
to the left of the Oscillator Bank (used in tuning and setting up a
sound), as well as the keyboard and the manual controls on the panel
to its left (used during performance). All of these controls have an
effect on the oscillators’ pitches, while the Modulation Mix and
keyboard may also be used to control the filter.
MODULATION MIX
Oscillator 3, unlike Oscillators 1 and 2, is available as a
control signal in addition to functioning as an audio signal. As a
control signal, it may be mixed with the output of the Noise Source
using the MODULATION MIX control (3) and introduced whenever the
performer wishes, using the MODULATION wheel (29). The procedure
described below will familiarize you with the use of the Modulation
Mix in controlling the pitch of Oscillator 1:
1 ) Turn off switch (B), so that the pitch of Oscillator 3 is not
affected by the keyboard.
2 ) Turn off switch (G) and turn on switch (C). Now you are hearing
Oscillator 1, but not Oscillator 3, when a key is depressed.
3 ) Set Oscillator 3’s RANGE switch (9) to the LO position, its
FREQUENCY control (10) to mid (0) position, and its WAVEFORM
switch (11) to the triangular (extreme left) setting. This
produces a very low frequency triangular waveform which
oscillates only a few times a second.
4 ) Set the MODULATION MIX control to 0, so that its signal is that
of Oscillator 3. Turn on the OSCILLATOR MODULATION SWITCH (A).
This switch directs the Modulation Mix signal to control the
oscillators’ pitches.
5 ) The slowly varying output voltage of Oscillator 3 is now going
through the MODULATION wheel (29) at the left of the keyboard,
and from there may be applied to periodically change the
oscillators’ pitches (we will hear its effect on Oscillator 1).
The MODULATION wheel is in effect a level control for the
Modulation Mix. Slowly move the MODULATION wheel back and forth
with your left hand while holding down a key with your right hand.
The position of the Modulation wheel will determine the amount of
variation you hear in the pitch of Oscillator 1.
6 ) Change the setting of Oscillator 3’s FREQUENCY control and notice
the resulting increase and decrease in the speed of the modulation
6
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