Chapter 5. Creating Patches; How A Patch Is Organized; How A Tone Is Organized - Roland XV-88 Owner's Manual

Chapter 5. Creating Patches

With the XV-88, you have total control over a wide variety of
settings. Each item that can be set is known as a parameter.
When you change the values of parameters, you are doing
what is referred to as Editing. This chapter explains the
procedures used in creating Patches, and the functions of the
Patch parameters.

How a Patch Is Organized

The type of sound most commonly played on the XV-88 is
called a Patch. Each Patch can be configured by combining
up to four Tones.
fig.01-04.e
Patch
Tone 4
Tone 3
Tone 2
Tone 1
LFO 1
WG TVF
Pitch TVF
Envelope Envelope

How a Tone Is Organized

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
Tone
LFO 1
WG TVF
Pitch TVF
Envelope Envelope
audio signal
LFO 2
TVA
TVA
Envelope
LFO 2
TVA
TVA
Envelope
control signal
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.
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.
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