Modulation Test; Modulation Source Test Patch - Sequential Pro One Technical Manual

1-9
MODULATION TEST
This t e s t checks t h e LFO waveshapes, t h e t h r e e MODULATION FROM AMOUNT knobs
and ROUTE switches, a n d t h e f i v e destination (TO) switches.
(The FIL ENV and OSC B
modulation sources were
t e s t e d above.)
Since
this test
includes the LFO, don't use
the
arpeggiator or sequencer.
Figure 1-7
MODULATION SOURCE TEST PATCH
1.
Patch according t o Figure 1-7. (AMPLIFIER RELEASE
must
be g r e a t e r than FILTER
RELEASE
to
h e a r
t h e
complete filter envelope.)
2. Hold
a key
or use
DRONE. Raise t h e LFO AMOUNT knob and note increasing
frequency sweep of
OSC
A. Since OSC A frequency is being controlled by the LFO
sawtooth,
t h e frequency rises consistently, then s n a p s back
to
t h e t'initial"frequency
[para. 2-19).
3.
S w i t c h
LEO SAWTOOTH off and LFO SQUARE on. This
will
give a
futrillM
effect,
w i t h t h e interval expanding with increased LFO
AMOUNT. A t 4
-
5
on
t h e dial t h e
higher n o t e will be a n octave- above the i n i t i a l frequency. A t a b o u t position
8
t h e range
will be
t w o octaves, (para. 2-19)
4. S w i t c h LFO SQUARE off
and
LEO TRIANGLE on. A symmetrical vibrato
should be
heard. Adjust L F O FREQUENCY O
-
10
to explore t h e range
of vibrato available
(which is
f r o m a b o u t 1/4 to
about
25
Hz).
Leave LFO FREQUENCY set t o about 6 .
Return LEO AMOUNT t o
0.
i
5.
A d j u s t OSC
B AMOUNT
0
-
10
t o
check
OSC 0
as
rnoddlation
s6urce. The effect will
be
a
vibrato
similar
t o that
produced
by t h e
LFO.
Adjust
OSC B FREQUENCY
t o
hear
t h e range, Leave OSC
B
FREQUENCY and
OSC
B AMOUNT
set t o
0.