DOEPFER A-126 Handmatig - Pagina 5

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6. User examples

A typical use for a frequency shifter is to transform the

human voice - for instance, in a simple example, to

produce 'robot voices'.

A kind of vibrato effect can be produced by modula-

ting the frequency-shift with a slow sine-wave from an

LFO (frequency about 5 - 7 Hz).

More drastic effects can be produced by replacing the

sine wave with a sawtooth (frequency about 1 - 2 Hz)

to produce a repeated rising modulation.

With the patch in fig. 1 you can 'roughen up' audio

signals (e.g. voices) by modulating the frequency-shift

with colored noise, and sending the original and the

frequency-shifted signals to a mixer, to control the

amount of 'harshness' or 'edge'.

With the patch in fig. 2, you can create a new type of

percussive stereo effect, using the square wave from

an LFO (frequency c. 5 - 6 Hz) to modulate the

frequency-shift and continuously alter the side-bands.

The Up and Down outputs are sent to left and right

stereo channels respectively.

System A - 100

Audio-

Signal

fig. 1: "roughening up" an audio signal

Audio-

Signal

fig. 2: percussive stereo effect

VC Frequency Shifter

VCFS

A-138

CV In

Colored

A-118

VCFS

Down

CV In

LFO

A-126

VCA