Doepfer A-171 VC Slew Limiter - Manual (Page 4)

A-171 VC Slew Limiter System A - 100 doepfer
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4. In / Outputs
! CV 1 • " CV 2
The transition speed produced by the A-171 depends
on a combination of the setting on the Rate control,
and any voltages patched into the CV inputs ! and ".
The level of the voltage at CV input " can be control-
led by attenuator 2.
§ Sign. In • $ Sign. In
These interconnected sockets are the signal input to
the VC Slew Limiter. Whatever signal is patched in to
these inputs will have any sudden voltage jumps
smoothed into more gradual rises and falls, at a rate
depending on the manual control and the CV inputs.
% Out
The modified signal is available at output %.
5. User examples
Voltage controlled slew limiting in a MIDI
system
Unlike the A-170 Slew Limiter, the A-171 can have the
rate of rise and fall voltage controlled.
In particular, there’s the possibility of controlling the
Rate parameter via a MIDI-CV interface (eg. A-190,
A-191) as you play in real time. The next example
makes use of this feature.
Adjustable portamento
The example in Fig. 2 uses the A-171 as a porta-
mento generator. The portamento time is adjustable,
and with this patch can be controlled from a MIDI
keyboard. Simply set the A-191’s CV2 output to your
chosen MIDI controller (eg. Portamento Time). Pay
attention that an increasing control voltage causes a
shorter transition time. To obtain the opposite beha-
viour a voltage inverter A-175 can be used (A-191 CV
output -> A-175 input, A-175 output -> A-171 control
input).