Owner`s manual
MODULATION 
(Low-Frequency 
Oscillator) 
All 
the 
controllers 
mentioned 
up 
to 
this 
point 
have 
generated 
non-repetitive 
voltages; 
the 
keyboard 
generates 
a 
static 
voltage 
level 
for 
each 
key, 
and 
the 
contour 
generators 
output 
a 
"one-shot" 
voltage 
pattern. 
Musical 
sounds 
demand 
repetitive 
changes 
such 
as 
vibrato, 
trills, 
or 
tremolo. 
On 
The 
Source, 
repetitive 
changes 
are 
controlled 
by 
a 
low-frequency 
oscillator 
This 
oscillator 
generates 
waveforms 
exactly 
like 
the 
audio 
oscillators, 
but 
operates 
in 
a 
much 
lower frequency 
range 
(1 
cycle 
every 
3 
seconds 
to 
30 
cycles 
per 
second). 
The 
output 
of 
this 
oscillator 
is 
a 
triangular 
or 
square 
waveform. 
This 
output 
voltage 
may 
be 
routed 
to 
the 
control 
inputs 
of 
the 
oscillators 
and/or 
filter, 
through 
the 
Mod 
wheel. 
Touch 
program 
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■ 
PROGRAMS 
38 










