Studio Electronics ATC-X Operation Manual page 16

Modulation is the use of a control signal to create a
repetitive pattern of pitch, level, or harmonic content
changes. The shape of the modulation is determined by the
waveform that the LFO outputs––selected by the wa v e
switch pad. In addition to the four selectable waveshapes,
sample & hold and noise provide random modulation. The
amount of modulation is determined by either the depth
control or any assigned MIDI controller. The ATC-X's two
Low Frequency Oscillators, or LFO
variety of parameters, and LFO 2
MIDI time clock (see PROGRAM). The ATC-X also has the
capability of allowing Oscillator 2 to modulate Oscillator 1
and the frequency of the filter. This is known as Audio
Frequency Modulation because the modulation control signal, in this case Oscillator 2,
resides in the audio spectrum.
What the Switch pads do:
Selects the audio frequency modulation assignment - Oscillator 1, Filter
frequency, or both. The frequency of Oscillator 1 is modulated by the audio
output of Oscillator 2 when the display reads OSC
Filter is modulated by the audio output of Oscillator 2 when the display
reads VCF
O O - - F. F.
Selects the amount of Audio Frequency Modulation. Use this control in
conjunction with Oscillator 2 frequency and mode 2 to create often-
clangorous effects. The second press of the X AMNT/RMOD button brings
up the ring mod function for editing. Use the encoder knob to set the
desired ring mod depth between oscillators 1 & 2. A setting of '0' is = OFF
(hardware patchable via back panel connections).
LFO s, are assignable to a
LFO 2 can be synchronized to
The switch pads for LFO 1 and 2 operate in the same manner:
rate/ke y adjusting the frequency of the LFO and "key triggering" rate/ke y
the start of the LFO wave cycle, and depth/phase
modulation signal and selecting the up or down start point of the
LFO wave cycle. To select the sound source or parameter to be
modulated by the LFO, press the target
for the LFO assignment list). To enable key triggered LFO wave
cycling––each new note initiating the start of the wave cycle––press
the rat e/ke y rat e/ke y L FO 1 L FO 1 or LFO 2 2 twice and turn encoder to select. To
invert the phase––select the up or down start point of the LFO wave
cycle––press the depth/phase depth/phase twice and turn encoder to select.
VCF and both are modulated by Oscillator 2 when the display reads
wa v e
depth/phase attenuating the
target switch pad (see page 15
OSC. The frequency of the