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
