Doepfer A-149-1 Quantized/Stored Random Voltages - Manual (Page 6)

A-149 /1 RCV System A - 100 doepfer
6
tempo of the VCLFO A-147. Thus as the range of pitch
selection increases the number of possible spectral
ranges becomes exponentially (or geometrically) grea-
ter. As the tempo of the VCLFO is controlled by the 2
n
output too, bright sounds are accompanied by longer
events, longer events are accompanied by greater
range pitch range possibilities and the number of of
range probablities for pitch selection is correlated ex-
ponentially. This tail-chasing configuration may last a
few hours (to obtain Allen Strange's original patch a
voltage inverter A-175 has to be inserted between the
2
n output and the control input of the VCLFO as the
CV input of A-147 controls the tempo rather than the
period).
More examples with random voltage sources can be
found in Allen Strange's book from page 80 (e.g. the
"Dream machine" on page 85).
Some additional ideas:
●
Use the RND Clock output of an A-117 Digital
Noise Generator as clock input for the A-149-1 to
increase the randomness of events.
●
Use the Quantizer module A-156 to obtain more
restricted pitch voltages (e.g. only notes from major/
minor scale/chords)
●
Combine the A-149-1 with a A-155 sequencer
(common clock) to obtain random envelopes (A-
142), timbre (filters), loudness (VCA) or stereo posi-
tion (VC panning A-134), frequency shifting (A-126)
VCO
A-147
VCA
ADSR
VCF
CV
n+1
A-149-1
RCV
2 n
CV N
CV N
Clk In
Fig. 2: "Random patch" adapted from Allen Strange's book "Electronic music - systems, techniques and controls"