Sequential prophet 5 - Saving a Program

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2-8
MISCELLANEOUS
RELEASE
switch;
This
was
discussed
in
paragraph
1-5. When switched
off,
the filter
and
amplifier
release
times
are
programmed
to a
minimal
setting
so
there
will
be
no
release
but
also
no
audible
"whack"
which
would
be
caused
by the
instantaneous
closing
of the
VGA.
To
allow
operation
of
the
release
footswitch,
the
RELEASE
switch
must
be
off.
UNISON
switch;
When
this
switch is
on,
the
Prophet-5
will assign all
five
voices
to the
lowest
note
played.
The
Prophet
thus
becomes a
very
"fat"
monophonic synth. When
the
monophonic
sequencer
interface
(see
paragraph
:3-3) is being used,
four
voices will
be
available
for
UNISON
assignment.
GLIDE
knob;
Effective
only
when
UNISON
is on,
the
GLIDE module is a
"lag
processor"
which
can
delay
the
rate
at
which the
KEYBOARD
CV (which
controls the oscillators
and
filter)
can
change.
When
set
to
the
KEYBOARD
CV instantly steps between
notes.
As the
GLIDE
knob
is
advanced,
the
CV
does
not step between
the notes,
but
begins to
"slew."
This
introduces
"portamento"
between
notes.
2-9
MODULATION
A
synthesizer's
expressiveness
stands oh
its
modulation
facilities. The term "modula-
tion"
refers
to a
periodic
or
consistent
(as
opposed to
random) aural change
which is
interesting
or
musically
useful.
Modulation
is
created
by electronic
controllers when it
is
not
possible
to adjust a
mechanical
controller
with the
required speed or precision.
Modulating
devices
therefore
free the
hands
for
playing the keyboard.
Modulation
involves
the
signal-generating
source
and
the modulated
destination
.
The
Prophet contains
two
distinct
modulation
systems:
WHEEL-MOD and
POLYphonic-
MOD. The
WHEEL-MOD
system (see
Figure
2-7)
has
two sources,
LFO and pink noise,
and
five
destinations;
OSC
A
frequency
and
pulse-width,
OSC
B
frequency
and pulse-
width, and
filter frequency.
In
the
LFO module, the
FREQUENCY
knob adjusts
LFO
frequency from approximatley
0.0^ Hz (or,
1
cycle every
25
seconds)
to 20
Hz. The
SHAPE
switches select the full-
level
modulating waveforms. In the
WHEEL-MOD
module,
the SOURCE
MIX knob
determines
the relative
amount of
LFO or
noise sent to
the
destination; for all
LFO
as
source and
10 for all noise as
source.
To the
left of the
keyboard, the
MOD wheel
itself
determines
the
actual
modulation
level.
In
addition to
the
WHEEL-MOD system,
the Prophet's
unique
POLY-MOD
system (see
Figure
2-8)
provides
routings
within each
voice
for two sources,
the filter envelope
generator
or
OSC
B, to modulate three
destinations: OSC
A frequency,
pulse width, or
filter
frequency.
Although the routings are
exactly the
same
for
each voice,
the
minute
but
omnipresent
differences between the
voices
(e.
g.
phase
relationship of the
oscillators)
will
create
modulation effects
that will be unique
from
voice
to voice or
note
to note.
This
is in
direct contrast to
the effect of
WHEEL-MOD,
where
one
signal
is
applied
equally
to
the voices,
yielding
the same effect
from note to note.
(There will
be no
POLY-MOD
if
the
two
SOURCE
AMOUNT knobs are set to or if the three
destination
switches
are
off.)
CMIOOOD
2/82
2-9