Kurzweil Forte - Manual (Page 173)

Program Edit Mode
Editing VAST Programs With KVA Oscillators
7-76
press the << soft button to change soft button pages until you see “DupLyr.” Press DupLyr to
duplicate the layer, creating layer 2. In layer 2, on the ALG page, change the function block
to “>> SYNC SQUARE (slave)”, and set the Alt Input parameter to “Layer 1.” The final step
is to go to Layer 1’s DSPCTL page and turn the Level parameter all the way down, to -96dB
(this ensures that you will only hear the output of the slave oscillator on layer 2, which is the
intended function of Sync Square).
Now the Sync Square oscillator should be working. The “Syncoff” parameter, Sync Offset, is
the main parameter for shaping the tone of this sound. Syncoff sets the sync offset between
the master and slave square waves in each corresponding oscillator, which changes the shape
of the waveform output by the slave oscillator. The Sync Square oscillator is most expressive
when the Syncoff parameter is modulated during performance. Use the DSPMOD page
to assign an envelope or continuous controller like the Mod Wheel for this parameter to
hear the effect (see The DSP Modulation (DSPMOD) Page , as well as The DSP Control
(DSPCTL) Page and Common DSP Control Parameters in Algorithm Basics on page
7-34 , for details on setting up modulation and other ways to control parameters, and see
The Envelope 2 (ENV2) and Envelope 3 (ENV3) Pages for details on using envelopes as
modulation sources). See Advanced Use Of KVA Oscillators below for some similar examples
of how to set and control modulation for oscillator specific functions and other parameters.
To add a DSP function to the Sync Square oscillator, you’ll need to use cascade mode. For
example, to add a filter, duplicate one of the layers to create layer 3. On layer 3, select the
ALG page and choose one of the cascade mode algorithms, algorithms 101-131. For this
example, lets use alg 105 with the filter “4Pole Mogue LP” selected for the function block.
For the Alt Input parameter, select Layer 2. This routes a pre-Level parameter copy of Layer
2’s output into Layer 3. Go to layer 2’s DSPCTL page and turn its level down to -96dB
(otherwise the un-filtered sound from layer 2 will be audible as well as the filtered sound in
layer 3). Now you can hear the Sync Square from layers 1 and 2 running through the filter in
layer 3. See Advanced Use Of KVA Oscillators below for examples of how to set and control
modulation of filter parameters.
Advanced Use Of KVA Oscillators
Read the KVA sections above before moving on to this section.
If you have tried the program described above in
Basic Use of KVA Oscillators , you may have
noticed that there is no variation in the notes played aside from pitch. Layers and programs
created with KVA oscillators can become much more expressive by introducing variation
with DSP modulation. For a KVA oscillator layer, you can use DSP modulation just as you
would for keymap layers (see Common DSP Control Parameters , The DSP Modulation
(DSPMOD) Page , and The DSP Control (DSPCTL) Page ). Several KVA oscillators also
have their own modulation parameters that must be accessed to control the oscillator’s
intended function. Aside from these methods, KVA layers can also be altered by using
keymaps with natural amplitude envelopes. See below for details on each method.