Doepfer A-100(~ 40 MB) - Manual (Page 437)

doepfer System A - 100 LFO A-145
5
5. User examples
An LFO can be used for all sorts of different modulati-
ons:
• LFO - VCA (A-130, A-131, A-132)
Modulation of the gain produces Tremolo
• LFO - VCF (A-120, A-121, A-122, A-123)
Modulation of the cut-off frequency produces cycli-
cal variation in tone colour - Wah-wah
• LFO - VCO (PWM A-110, A-111)
Pulse width modulation using the LFO produces
cyclical variation in tone colour (phasing type)
• LFO - VCO (FM A-110, A-111)
Pitch modulation using LFO produces vibrato.
• LFO - VCP (A-125)
Phase shift modulation using LFO produces cyclic
phasings or phase vibrato
The above effects occur with LFO frequencies in the
sub-audio range. Once the LFO gets into the audio
range, timbral changes always occur. Examples and
further notes can be found in the manuals for the
respective modules.
Producing echo effects
As well as modulation effects, LFOs can also create
time-based repeat effects. In Fig. 3 the LFO is being
used to produce an echo effect. The frequency and
waveform of the LFO determine the delay-time and
character of the sound, and the ADSR parameters
determine the envelope and feedback amount of the
echoes.
Fig. 3: Producing an echo effect
LFO
V CO
ADSR GAT E
VC A 1 VC A 2