Oscillator A Test; Osc A Test Patch - Sequential Pro One Technical Manual

1-3 OSCILLATOR A TEST
Figure 1-1
OSC A TEST PATCH
1. Patch according
to Figure
1-1.
2. Check that 0 S C A
FREQUENCY
knob range exceeds one
octave.
For reference,
play
C2 (which is one octave below the highest
key,
C3)
and remember
pitch. Then
hold C1 and
raise
OSC
A FREQ. The pitch should increase smoothly, approaching the
r e f e r e n c e pitch a t 7
-
8
on the
dial. A t 10
the
pitch should
be
at least a whole s t e p
above t h e r e f e r e n c e .
3. Turn OSC A FREO to
0. C h e c k OSC A
OCTAVE
switch f u n c t i o n
by
playing C2 a n d
. . .
switching
octaves
down t o 2,
1, and 0. NOTE: When switching octaves with a key
depressed, it is normal t o
hear
the pitch "jump" between octaves.
'
"
4.
Switch OSC A OCTAVE t o 2,
and switch
OSC
A
SYNC on.
Rotate
OSC A FREQ
knob 0
- 10 to check sync function.
5. Switch OSC A SYNC off. Switch OSC A SAWTOOTH off. Switch 0 5 C A PULSE on.
The
difference between the 'Ibrassylr sawtooth
and tfwoody" pulse should
be
obvious.
Rotate OSC
A
PULSE WIDTH knob 0
-
l o , listening for
t h e timbral e f f e c t of varying
harmonics. The
pulse
will
degenerate t o d c (or
very
nearly
dc--99% duty cycle)
at
the
extreme knob settings,
resulting in no (or very
little) sound. Find the
setting where t h e
second harmonic drops out (50% duty cycle). This normally occurs between dial
markings 5 and 6 .