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4–2: PCM OSC
4–2a
Using PCM in the STR-1
Using PCM samples to "pluck" the string
In addition to the Pluck and the Noise Generator, you can
also "pluck" the string with PCM samples. In general, this
will work best if you use a fast envelope to control the level
of the PCM in the Excitation Mixer, so that it becomes just a
short attack transient.
For instance:
1. Follow the steps under "Creating an initialized STR-1
Program" on page 214.
2. Press the EXi 1 tab, to get to the STR-1 parameters.
3. Go to the PROGRAM > STR-1: String– Excitation
Mixer page.
4. Set the PCM Level AMS 1 source to EG 3, and the
AMS1 Intensity to 50.
5. Go to the PROGRAM > STR-1: EG– EG3 page.
6. Set the Start and Sustain Levels to 0, and the Attack
and Break Levels to 99.
7. As a first pass, set the Attack Time to 0, the Decay
Time to 10, and the Slope Time to 2.
With these settings, the Attack Time controls how fast the
EG attacks, the Decay Time sets the duration, and the Slope
Time controls the decay.
8. Use Key Track or Note Number to modulate the
Decay time via AMS, so that it is shorter for higher
notes, and longer for lower notes.
If you use looped PCM as the excitation, without EG control
of the amplitude, it will tend to sound like bowing. In this
case, using a bit of constant Harmonic Pressure can
produce a good effect; among other things, this removes
some energy from the string.
PROGRAM > STR-1: String 4–2: PCM OSC
Using the string as a comb filter for PCM
You can use the string as a comb filter for the PCM
Oscillator. To do so:
1. Follow the steps under "Creating an initialized STR-1
Program" on page 214.
2. Go to the PROGRAM > STR-1: String– PCM OSC
page, set MS1 to use "Multisample Select" 00433
POWER SAW.
You can use this technique with any Multisample, but a
sawtooth waveform will make the effect particularly clear.
3. On the PROGRAM > STR-1: String– Excitation
Mixer page, set the Pluck Level to 0, and the PCM
Level to 25.
4. On the PROGRAM > STR-1: EG– EG2(Pitch) page,
set the Attack Time to 50, and the Decay Time to 70.
5. Set the Break and Sustain Levels to +25.
6. Set the Attack and Decay Curves to +5.
7. On the PROGRAM > STR-1: String– String Pitch
page, in the EG section, set the Intensity to +36.00.
EG2 (Pitch) is already selected, by default. In this setup, the
string's pitch controls the frequency of the comb filter.
8. Play a note in the lower part of the keyboard.
Notice how the Program makes a sweeping sound, with
some resemblance to oscillator sync. That's the sound of the
comb filter.
9. Experiment with the PROGRAM > STR-1: String–
String Main page's Decay parameter.
Decay controls the resonance of the comb filter.
10.Experiment with the Damping and Dispersion
parameters.
These can change the character of the comb filter in
interesting ways.
4–2PMC
213
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