Doepfer A-126 VC Frequency Shifter (no longer available) - Manual (Page 6)

A-126 VC Frequency Shifter System A - 100 doepfer
6
If you increase the LFO frequency into the audio range
(above about 20 Hz), other effects are produced.
Particularly if the LFO frequency is harmonically rela-
ted to the fundamental of the audio signal, this can be
a very pleasing effect.
One popular effect in the past was to frequency-shift
an octave band of sound, produced by band-pass
filtering the output from a noise module (see fig. 3).
fig. 3: frequency-shifting an octave band
Interesting and unusual percussion sounds can be
produced with the patch in fig. 4.
In this patch, a percussive sound (e.g. kick drum,
snare) is fed into the frequency shifter. Using the shift
control, you can then alter the apparent size of the
instrument.
By deriving a trigger or gate signal from the drum, and
controlling the frequency shifting with a short enve-
lope, some effective and exciting percussion sounds
emerge.
fig. 4: using the A-126 for new percussion sounds
VCF
LFO
CV In
VCFS A-118
VCFS
Drum-
Signal A-119 ADSR
Gate
Out
Up
Audio
In