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

LFO 2

 

WG

TVF

TVA

Pitch

TVF

TVA

Envelope

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

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.

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.

Chapter 5

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Roland XV-88 owner manual Creating Patches, How a Patch Is Organized, How a Tone Is Organized