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20
Chapter 1. Overview of the XV-88
Classification of XV-88 Sound
Types
When using the XV-88, you will notice that a variety of
different categories come into play when handling sounds.
What follows is a simple explanation of each sound category.
Tones
In the XV-88, the Tone is the smallest class of sound.
However, it is not possible to play a Tone by itself. The Patch
is the unit of sound which can be played, and the Tones are
the basic building blocks which make up the Patch.
fig.01-03.e
Tones consist of the following five components.
WG (Wave Generator)
Specifies the PCM waveform (wave) that is the basis of the
sound, and determines how the pitch of the sound will
change.
The XV-88 has 1,083 different waveforms (p. 263). All Patches
built into the XV-88 consist of combinations of Tones which
are created based on these waveforms.
There are four wave generators for each Rhythm Tone
(percussion instrument sounds).
TVF (Time Variant Filter)
Specifies how the frequency components of the sound will
change.
TVA (Time Variant Amplifier)
Specifies the volume changes and the sound’s position in a
stereo soundfield.
Envelope
You use Envelope to initiate changes to occur to a sound over
time. There are separate envelopes for Pitch, TVF (filter), and
TVA (volume). For example if you wish to modify the way in
which the sound attacks or decays over time, you would
adjust the TVA envelope.
LFO (Low Frequency Oscillator)
Use the LFO to create cyclic changes (modulation) in a
sound. The XV-88 has two LFOs. Either one or both can be
applied to effect the WG (pitch), TVF (filter) and/or TVA
(volume). When an LFO is applied to the WG pitch, a vibrato
effect is produced. When an LFO is applied to the TVF cutoff
frequency, a wah effect is produced. When an LFO is applied
to the TVA volume, a tremolo effect is produced.
LFO is not included in the Rhythm Tones (percussion
instrument sounds).
Patches
Patches are the basic sound configurations that you play
during a performance. Each Patch can be configured by
combining up to four Tones. How the four Tones are
combined is determined on the STRUCT page (PATCH/
COMMON) (p. 73).
fig.01-04.e
WG
Pitch
Envelope
TVF
TVF
Envelope
TVA
Envelope
TVA
LFO 1 LFO 2
control signal
Tone
audio signal
Patch
Tone 4
Tone 3
Tone 2
Tone 1
WG
Pitch
Envelope
TVF
TVF
Envelope
TVA
Envelope
TVA
LFO 1 LFO 2