Doepfer A-100(~ 40 MB) - Manual (Page 471)

doepfer System A - 100 Dual VCS A-150
5
Switching between modulation sources
In the example in Fig. 3, the A-150 switches between
two filter cut-off modulation sources. The control
voltage CV
S
(for instance from a MIDI controller) de-
termines whether the ADSR (when CV
S
= 0 V) or the
output from the mod wheel CV
M
(when CV
S
= +5 V)
controls the cut-off frequency of the filter.
Fig. 3: Switching between modulation sources
Switching by audio-range signals
In Fig. 4, the A-150 is set up to switch the audio output
of a VCO. The switching voltage is provided by the
VCO’s square wave output, with the result that at each
half cycle, synchronised to the VCO frequency, the
waveform changes to sawtooth. Try variations on this
patch, with an independent VCO or LFO providing the
switching voltage, different frequencies, etc..
Fig. 4: Audio-range switching of an audio signal
CV
O/I
A-150
I/O 1
I/O 2
A-110
VCO
VCO
CV
S
VCA
CV
O/I
A-150
I/O 1
I/O 2
VCF
CV
M
ADSR Gate