Program Mode
Function Soft Buttons
6-53
Editing VAST Programs With KVA Oscillators
The PC3A uses KVA oscillators as another way to generate sounds in VAST programs. Unlike
keymaps, which play samples stored in ROM, KVA oscillators create DSP-generated waveforms
every time they are triggered. The KVA oscillators can create a range of waveforms, from high
quality simple waveforms familiar to users of classic analog synths, to complex waveforms
which take advantage of the PC3A’s internal processing power and complex signal routing
capabilities. Though the PC3A does have keymaps containing samples of basic synth waveforms,
the use of KVA oscillators provides users with better portamento, more modulation options,
higher sound quality, and other advantages which will be explained in this section. Learning to
use KVA oscillators instead of keymaps (where appropriate) is simple and will increase the
versatility of your VAST editing capabilities. VAST programs using layers with KVA oscillators
can also be combined with other layers using keymaps.
Basic Use of KVA Oscillators
To understand the basic minimal setup of a KVA based program, select the program
1019
VA1NakedPWMPoly,
and press the
Edit
button. If you are familiar with editing VAST programs,
the first thing you may notice is that on the KEYMAP page, Keymap is set to
999 Silence
(More
on this in
Advanced Use Of KVA Oscillators
on page 6-55
.) Next, look at the AMPENV page. The
AMPENV mode is set to
User
, which gives you control over the amplitude envelope (more on
using
Natural
mode later.) Finally, look at the ALG page. In the current algorithm the 3 block
KVA oscillator
PWM
has been selected, which generates the sound for this layer of the program.
Minimal Settings for Basic Use of KVA Oscillators:
The patch described above contains the minimal settings that a KVA layer needs in order to
function in the style of a classic analog synth. These minimal settings are:
1. EditProg:KEYMAP Page: Set the Keymap parameter to
999 Silence.
2. EditProg:AMPENV Page: Set the Envelope mode to
User
, and adjust the amplitude envelope
to your liking (see
The Amplitude Envelope (AMPENV) Page
on page 6-42
.).
3. EditProg:ALG Page: Pick an Algorithm and set an Oscillator (see
Setting KVA Oscillator Type
below.)
Further basic VAST settings that you will likely want to adjust are:
• Monophonic On/Off (see
The COMMON Page
on page 6-35
.)
•
Level Velocity Tracking (see
The DSP Control (DSPCTL) Page
on page 6-29
.)
Read the
Setting KVA Oscillator Type
section below to learn about how set each type of oscillator.
After doing this, you can experiment with making KVA programs by following the above
settings, and then setting and listening to each type of oscillator. Once you understand how to do
this, read on to the
Advanced Use Of KVA Oscillators
section on
page 6-55
(see below) to learn how
to make your KVA patches more expressive through the use of DSP modulation.
Pitch Settings for KVA Oscillators
Each oscillator (except for noise functions) has its own pitch parameters, and is unaffected by
pitch settings that would normally affect keymaps (such as those on the Keymap page.) On a
program layer, the coarse pitch parameter for the oscillator in use can be found on both the
DSPCTL and DSPMOD pages, in the parameters list below the standard Pitch parameter for
keymaps. For each oscillator, its coarse pitch parameter is named by an abbreviation of the
oscillator name followed by “Pch.” For example, the coarse pitch parameter for a saw wave
oscillator will be called Saw Pch. On the DSPCTL sub page for any oscillator Pch. parameter, you
can adjust fine pitch by cents and Hertz, as well as KeyTrk and VelTrk settings for pitch.
Содержание PC3A
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