Roland SH-1 - VCO Linearity and Range Adjustments

HIGH PASS
FILTER
HIGH PASS
FILTER
Before entering the
VCF, the signals mixed
in the AUDIO
MIXER
pass
through the
HPF (High Pass
Filter). The HPF blocks
iow
frequencies and passes
high frequencies.
With the
CUTOFF
FREQ
control at its
lowest position,
all sounds pass through the
HPF
without change; this may be
thought
of as its normal
position. When the CUTOFF
FREQ control is raised, the
HPF will
remove the lower
harmonics from the sound
source, thus
brightening the sound. It is
normal for higher positions of this
control
to produce
lower levels
of output
sound;
compensate for
this by raising the
VOL-
UME
control.
The
HPF can be used
for synthesizing
harpsichord and oboe
sounds, for example.
WAVEFORM CHANGES IN THE HPF
°U_1
w
B
V
k
N
HPF FREQUENCY
RESPONSE
dB
FREQUENCY
ACTION TO BE TAKEN
WHEN
DESIRED
SOUND CANNOT BE
PRODUCED.
Tune
with piano,
organ,
pitch pipe,
tuning
fork, etc.
Raising
HPF
may
reduce
volume.
No
sound
is produced
when ail
ENV
controls
are
set
at
"0"
Normally
set at
KYBD GATE.
Normally
set PORTAMENTO at
"0"
-
"3".
VCF will
oscillate
with
Resonance at
high
position.
With
HOLD at
high
position,
sound continues
indefinitely.
No
sound at
"0"
position.
No sound with
Cutoff Freq
at
very
low
position.
When no
sound
is
produced
at all
check
the
following
items.
(
1
}
Are
the
POWER
switches of
the
SH-1 and
amplifier
on?
(2)
Are volume controls of
the
external
amplifier, mixer,
etc. raised?
(3)
Are connections
correct?
(See
page
5.)
(4)
Are
the
cords defective?
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