Roland owner manual Classification of XV-88 Sound Types, Tones, Patches

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.

Tone	LFO 1	LFO 2
WG	TVF	TVA
Pitch	TVF	TVA
Envelope	Envelope	Envelope

audio signal 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.

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).

Patch

Tone 4

Tone 3

Tone 2

Tone 1	LFO 1	LFO 2
WG	TVF	TVA
Pitch	TVF	TVA
Envelope	Envelope	Envelope

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