User Manual

22
MODULATION (Continued)
PITCH AMT OSC 2 ONLY: Pressing this button applies pitch modulation to Oscillator 2 only, with no
effect on Oscillator 1. The button illuminates when it’s engaged.
If you engage the HARD SYNC OSC 2 button (which phase-locks the Oscillators), then modulating
Oscillator 2’s frequency with an LFO or Envelope will change the Oscillator’s harmonic content but not
its pitch.
FILTER AMT: This knob specifies the depth of variation applied to the Filter Cutoff frequency when
the MOD wheel is engaged. Applying LFO modulation to the Filter is useful for generating slow Filter
sweeps, wobbles, and repeating effects.
WAVE AMT: This knob specifies the depth of variation applied to the waveform of both audio
Oscillators when the MOD wheel is engaged. As the waveform is modulated, the amplitudes,
frequencies, and phase of the harmonics change dynamically. Waveform modulation has no effect on
the Sub Oscillator, which always generates a square wave.
NOTE: Using Shift mode or the plug-in editor, you can also assign Wave Amount to aect Oscillator 1 or 2
independently (see Hidden Parameters on page 30).
TRY THIS
LFO WAVEFORMS
It’s likely that much of the time when you’re playing melodic sounds, you’ll use the MOD wheel
to control note vibrato to make your playing more expressive. To try this, begin by selecting
your favorite lead or solo Preset. In the MODULATION section, turn the SOURCE knob
counterclockwise to its triangle-wave position. Turn PITCH AMT up to 2 and turn LFO RATE to
6. Play a note and nudge the MOD wheel up slightly to produce vibrato. Play a few more notes,
adding vibrato during sustained notes when it feels appropriate. Adjust the LFO RATE to taste.
Learn your way around the LFO by trying the other waveforms and destinations, and by varying
the LFO RATE and depth. Begin by turning up the PITCH AMT knob slightly, raising the MOD
wheel, and then switching the SOURCE knob to the square wave setting. Square wave LFO
modulation produces a trill that alternates between two pitches. Varying the LFO RATE changes
the speed of the trill, and varying the PITCH AMT or the MOD wheel depth changes its interval.
Now vary the LFO RATE, PITCH AMT, and MOD wheel depth using the SOURCE knob’s sawtooth,
ramp, and sample-and-hold settings. Notice that sawtooth and ramp-wave modulation work best
at slow rates, and sample-and-hold modulation works really well when it’s applied to modulate
the Filter with RESONANCE turned up at least halfway. When you’re exploring Filter modulation,
try turning down the Oscillator signal and turning up the Noise.
PULSE WAVE MODULATION
By routing LFO or Envelope modulation to an Oscillator’s wave amount, you give the waveform
motion by changing its harmonic content dynamically. As the control signal changes, so does
the waveform. Although the continuously variable Subsequent 25 Oscillators let you apply
modulation to any waveform, it’s most traditional to modulate a pulse wave.
Beginning with an initialized Patch, turn up Oscillator 1 in the MIXER section and turn the WAVE
knob halfway between square and pulse. Set the LFO RATE at approximately 3Hz and the LFO
waveform to triangle.
When you press a key and push up the MOD wheel, you’ll hear the LFO’s effect on pulse width.
Push it up only slightly, and you’ll hear a dramatic sweeping of the harmonics that sounds a bit