Doepfer A-100(~ 40 MB) - Manual (Page 416)

Quad AD/LFO A-143-1 System A-100 DOEPFER DOEPFER DOEPFER DOEPFER
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4. User Examples
The A-143-1 is suitable for all kinds of modulations where
normally LFOs or envelope generators are used. Please
refer to the user manuals of other envelope generators or
LFOs for details (i.e. all A-14x modules).
The units of the A-143-1 can be used as single devices or
several units can be combined to obtain complex envelopes
or LFOs. In principle any control voltage input can be
controlled by the A-143-1 to modulate the parameter in
question. Typical applications are:
• 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
By means of the universal vactrol module A-101-9 the
parameters A and D can be voltage controlled. Please
refer to the A-101-9 manual for details.
A special application of the quad AD generator is the
subsequent control of up to four similar modules (e.g. VCAs,
VCFs, VC phasers, VC flangers, VC frequency shifters …)
for quadrophonic sounds: