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Roland XP-30 Manual

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Chapter 1. Overview of the XP-30
XP-30 Configuration
■ Basic Configuration
The XP-30 consists of a sound source and controllers.
fig.1-01.e
Sound Source
The XP-30 sound source produces sound by responding to
commands in the form of MIDI messages received from its
controllers. It will also produce sound by responding to
commands received from various external devices it can be
connected to.
Controllers
Controllers include the keyboard, front panel sliders and
pedals which are connected to their respective rear panel
jacks. Adjusting these controllers enable you to produce or
modify sound.
■ Classification of XP-30 Sound
Types
XP-30 sounds are made up of the following types:
Tones
In the XP-30, the Tone is the smallest class of sound. Each
Tone consists of one sound. But when you play the XP-30
you will mostly play a Patch, which is made up of several
Tones. Tones therefore are the elements which collectively
form a Patch.
Tone configuration:
fig.1-02.e
WG (Wave Generator)
Using the Wave Generator, you select a waveform and set its
pitch.
TVF (Time Variant Filter)
With the Time Variant Filter, you modify the waveform’s
frequency characteristics.
TVA (Time Variant Amplifier)
With the Time Variant Amplifier, you set volume level and
set 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 the WG (pitch), TVF
(filter) and TVA (volume). For example, to modify a sound’s
attack and decay time, you would use TVA Envelope to
adjust volume changes to the sound over time.
LFO (Low Frequency Oscillator)
Use the LFO to create cyclic changes (modulation) in a
sound. The XP-30 has two LFOs. Either one or both can be
applied to effect the WG (pitch), TVF (filter) and/or TVA
(volume). To illustrate this control’s action, you can apply an
LFO to modify the WG (pitch) to create vibrato. If the LFO is
used to modify the TVA (volume), you’ll get tremolo.
Controller section (controllers such as
keyboard, pitch bend lever, etc.)
Sound source
section
Play
WG
Pitch
Envelope
TVF
TVF
Envelope
TVA
Envelope
TVA
LFO 1 LFO 2
control signal
Tone
audio signal
… 40 …


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