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EXi: MOD-7 Waveshaping VPM Synthesizer
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Notice how the sound becomes more flat and static. A small
amount of detuning can add a lot of interest to the sound.
4. While playing the keyboard, use the + button to
change VPM Osc 1’s Ratio Fine from +0.000 to
+0.003.
This also adds a chorusing effect. There’s a difference
between changing the
Ratio and the Freq Offset , however,
as we’ll see next:
5. Play different ranges of the keyboard: low, middle,
and high, including all the way up to the top of the
keyboard.
Notice how the speed of the chorus effect gets faster as you
play higher. With
Freq Offset , on the other hand, the speed
stays the same across the keyboard. Each is useful for
different purposes.
6. While playing the keyboard (arpeggios, for instance),
use the VALUE dial to sweep VPM Osc 1’s Ratio Fine
throughout its range.
Notice how the effect changes with broader detuning,
including new frequencies appearing both above and below
the root pitch.
Envelopes and VPM
Each VPM Oscillator can have its own volume envelope. As
we’ve noticed by using the Tone Adjust slider 9, changing
the level of a modulator affects the intensity of the FM.
Envelopes let you create interesting timbres by varying that
intensity over time.
Continuing from the above:
1. Set VPM Osc 1’s Ratio Fine back to +0.000.
The main Ratio should still be set to 1.
2. Set the Output Level to 75.
3. Notice that the Output section’s EG Select is set to
EG1.
This is the EG assigned to control the VPM Osc’s volume.
By default, EGs 1-6 are assigned to VPM Osc 1-6.
4. Go to the EG1 page, by pressing first the PAGE
button and then the MOD-7: EG button.
5. Set the Break and Sustain Levels to 00.
6. While playing the keyboard, experiment with
different settings of the Tone Adjust Slider 1 and 9.
These change the Ratio and Output Level of VPM Osc 1.
Notice the different sounds that this creates. Slider 9 will
often work well in the mid-to-low ranges; don’t keep it at the
maximum level!
Next, let’s create a more percussive sound:
7. In EG1, set the Decay Curve to 10(Exp).
8. Set the Decay Time to 22.
9. While playing the keyboard, experiment with
different settings of the Tone Adjust slider 1 and 9.
Depending on the Ratio (as set by Slider 1), this creates
percussive sounds with woody or metallic characters.
Modulating Ratio
So far, we’ve been using Tone Adjust to control Ratio. You
may also sometimes want to modulate this with other
controllers, or even with LFOs, EGs, and so on.
Ratio is one way of looking at pitch. On the MOD-7, you can
modulate each VPM Oscillator’s pitch in semitones and
cents, just as with other NAUTILUS EXi. To do so,
continuing from above:
1. Set VPM Osc 1’s Ratio to 4.
Notice that the Parameter Details area, in the upper right of
the screen, now has the heading “Pitch Modulation.” This
appears when any of the Ratio or Freq Offset parameters are
selected.
2. Set AMS1 to SW1 Mod (CC#80), and Intensity to
+12.00.
Now, pressing SW1 will raise the pitch of VPM Osc 1 by an
octave.
3. Press SW1, to turn it on.
Notice how this changes the timbre of the attack.
4. Change AMS1 to LFO1.
Now, the pitch is modulated by LFO1. This gives the attack
a swooping character, kind of like of a water droplet.
Filtered VPM
Vintage FM synths didn’t have filters. If you wanted the
sound to be darker, or thinner, or change in timbre at all, you
had to make it happen using FM.
Filtering adds another dimension to VPM, both in terms of
timbral possibilities and ease of use. For instance, if you like
the basic timbre but want it to be a little more mellow, you
can use a lowpass filter.
FM sweeps and resonant filter sweeps have different
qualities; use each for what it does best, or use them
together. Use highpass or bandpass filters, resonance, or the
MultiFilter to achieve sounds impossible with FM alone.
Filters can even be used in-between modulators and carriers,
as part of the VPM processing chain.
Filtering the VPM output
Filtering the output of a set of VPM Oscillators is simple and
effective. To do so:
1. Follow the instructions under “Creating an initialized
MOD-7 Program” on page 301.
2. On the MOD-7 Patch Panel, set the Algorithm to 08: 2
+ 2 + 2 -> Parallel Filters.
3. Press the PAGE button, the HOME button and then
the Tone Adjust tab. The PROGRAM > Home– Tone
Adjust page will display.
4. Press the Tone Adjust switches 3 through 6.
This mutes VPM Oscillators 3–6.
5. Go to the VPM Osc 1 page.
Just select one of the jacks on VPM Osc 1, and press the
Jump button in the Parameter Details area.
6. Set the Output section’s EG Select to None.
This means that the volume will be at its maximum,
unaffected by an EG.
7. Go to the PROGRAM > MOD-7: Filter– Basic page.