Doepfer A-191 Shepard Generator/16xMIDI-CV Interface (no longer available) - Manual (Page 16)

A-191 MCV 16 System A - 100 doepfer
16
Alright, we have to admit that to use the Shepard ge-
nerator to maximum effect does take a huge number
of modules. There aren’t going to be that many Sy-
stem A-100 owners (are there?) who have eight VCOs
or VCFs or VCPs and eight VCAs to use to produce a
perfect Shepard tone.
What’s much more important is to use the modules
you do have creatively.
Try all sorts of unlikely combinations of modules and
control voltages. For instance, two VCAs can produce
a very nice stereo panning effect, if you use two tri-
angle wave outputs which are 180° out of phase with
each other.
With four triangle waves which are 90° out of phase
with each other, and four VCAs, whose outputs are
fed to a quadraphonic sound system, you can produce
an interesting rotating effect (see Fig. 9).
It’s worth repeating: this is one of the modules where
experimentation is even more crucial than on some
others.
For instance: in the patch shown in Fig. 9, try using
triangle waves with different, unbalanced phase relati-
onships, for strange spatial lurches; or phasers for 3D
phasing ...... anything is worth trying.
Fig. 8: Patch for Shepard control of signal processing
VCA 1
Out
1
A-191
SPU 1
VCA 2 SPU 2
VCA 8 SPU 8
Audio In
S 0
T 0
S 45
T 45
S 315
T 315
Out
1
Out
1