DOEPFER A-147 Manual - Halaman 5

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5. User examples

An LFO can be used for all sorts of different modulati-

ons:

• VCLFO - VCA

Modulation of the VCA gain produces tremolo.

• VCLFO - VCF

Modulation of the cut off frequency produces cycli-

cal changes in tone colour (wah-wah).

• VCLFO - VCO (PWM)

Pulse width modulation causes cyclical changes in

tone colour.

• VCLFO - VCO (FM)

Pitch modulation produces Vibrato.

All the above refers to modulation in the sub-audio

range. With modulation at audio frequencies (the low

end of which the VCLFO can just get to), further

changes occur in the sound spectrum. Look at the

examples and suggestions in the manuals of the

respective modules.

System A - 100

Simulating string vibrato

The patch in Fig. 2 shows a string vibrato simula-

tion, copying the common guitar or violin playing

technique, in which the finger applying the vibrato

moves parallel to the fingerboard, in an oscillation of

varying speed, to produce a pleasing and natural

frequency modulation.

In this patch, the VCO is modulated by the VCLFO

(with the VCO's CV input attenuator set to a low level).

While the key is held down on the keyboard, the

VCLFO's frequency increases thanks to the control

voltage from ADSR 1; at the same time, the volume

decreases, thanks to the control voltage patched from

ADSR 2 to the VCA.

Instead of ADSR 1, whose control voltage is raising

the frequency of the VCLFO, and thus the speed of the

vibrato, it's possible to use a MIDI interface (for in-

stance an A-190 or A-191) and use aftertouch to

provide the control voltage to the VCLFO.

A-147

VCLFO