DOEPFER A-178 Manual - Page 6

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A-178
Theremin
A-178
THER
Theremin Volt. Source
Antenna
Offset
CV Out
0
10
-
+
Gate Out
0
10
Threshold
fig. 2: Recommended positioning of two A-178s
Using the gate function
The gate function in the A-178 gives you the facility to
have remote switching of events in real time, simply
by moving your hand towards the antenna.
The function can be used as a noise gate, using the
gate signal to switch a VCA on and off, either directly
or via an ADSR or slew limiter. Whenever the signal is
underneath a certain voltage, the VCA simply shuts
down.
6
System A - 100
In the patch in fig. 3, just a quick movement of one
hand can control both the frequency of the VCO, and a
rapid repeat of the envelope controlling the VCA, and
A-178
THER
Theremin Volt. Source
Antenna
thus produce tremolo.
Offset
CV Out
0
10
-
+
Gate Out
0
10
Threshold
fig. 3: User example for the gate function
An alternative to the patch in fig. 3 would be to use the
ADSR to control a filter as well.
Other possible uses: Start / Stop on a sequencer,
"one-shots" (ADSR-triggered noises, like thunder),
switching filter characteristics, etc. (see also the user
examples in the A-177 Foot Controller manual).
VCO
CV
A-178
ADSR
Gate
doepfer
VCA