Doepfer A-143-3 Quad LFO - Manual (Page 4)

Quad LFO A-143-3 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER
4
4. User Examples
An LFO can be used for all sorts of different modulations:
• VCO Pitch/Frequency Modulation
Pitch/frequency modulation of a VCO produces vibrato.
• VCO Pulse Width Modulation
Pulse width modulation of a VCO produces cyclical
variation in tone colour (sounds similar to phasing)
• VCA Loudness Modulation
Modulation of the gain of a VCA produces Tremolo
• VCF Frequency or Resonance Modulation
Modulation of the cut-off frequency of a VCF produces
cyclical variation in tone colour. For some filters even the
resonance can be modulated.
• VCP Phase Shift Modulation
Phase shift modulation of a phaser (e.g. A-101-3 or A-
125) produces cyclic phasings or phase vibrato
Please refer to the user’s manual of other LFOs or
modulation sources for detail (A-145, A-146, A-147, A-149-
1, A-118 random output).
By means of the universal vactrol module A-101-9 the
frequency can be voltage controlled. Please refer to the A-
101-9 manual for details.
In principle any control voltage input can be controlled by an
LFO to modulate the parameter in question.
A special application of the quad LFO is the simultaneous
modulation of several parameters of the same module.
Example #1: Wave Multiplier A-137
• LFO 1 controls Multiplication
• LFO 2 controls Folding Level
• LFO 3 controls Folding Symmetry
• LFO 4 controls Harmonics
Example #2: VC Mixer A-135
• LFO 1 controls VCA1
• LFO 2 controls VCA2
• LFO 3 controls VCA3
• LFO 4 controls VCA4