Roland JV-880 - The JVs Sound Units

THE
JV'S
SOUND
UNITS
The basic
sound
building blocks
of the JV-880
are described in this section.
Patches
TONES
The
sound programs used in
playing
the instrument are
called
Patches. A single
Patch is
itself
made
up of
several Tones.
-
Patch
Sound Output
Tones
are
the basic
sound elements used in creating Patches.
It is possible
to create
a
Patch using only
a
single
Tone; however,
sounds
of
remarl<able
complexity
and
richness can be created by
using
up to four Tones
in one Patch.
The structure
of a Tone
is shown below.
WG (Wave
Generator)
The Wave
Generator accesses a
waveform stored in internal
memory,
on optional PCM
Cards
or
expansion
board, to
be used
as
the basic sonic building block.
The Wave Generator also controls the pitch of the
waveform
at the same
time. As the
waveform
is the
basic sound
unit, it
is largely responsible for determining the character
of the final sound.
TVF
(Time Variant Filter)
This
filter
is used to process
the sound program
by
cutting
or boosting
the frequency elements
of
the
original waveform produced
by
the Wave Generator.
TVA
(Time
Variant Amplifier)
This filter controls the
volume
of the sound.
ENV
(Envelope
Generator)
The envelope generator
is
used to change pitch,
frequency
or volume over time,
when used
with the
WG, TVF or
TVA, respectively.
LFO
(Low Frequency
Oscillator)
This
oscillator applies
a periodic or
regular
change to
the pitch,
frequency
or
volume
when used with
the WG, TVF and
TVA, respectively. It
adds
expression
to the sound
by
creating various vibrato
effects.