doepfer a-171-2 voltage controlled slew processor/generator price : $180.00

module a-171-2 is a voltage controlled slew limiter with a lot of additional features beyond a simple slew limiter. it's mostly a licensed copy of ken stones vcs which is in turn based on the serge vcs.

these are the most important features:
manual control of the slew-up time

cv control of the slew-up time with polarizer

switch for linear/exponential shape of the rising section of the response curve

manual control of the slew-down time

cv control of the slew-down time with polarizer

switch for linear/exponential shape of the falling section of the response curve

signal input: the "to-be-slewed" signal

cv up input

cv down input

cv up and cv down sockets are normalled

exponential cv input: named "v/oct" in the original design but as it's not really exactly 1v/oct we will name this input probably "exp.cv", mainly used for vclfo/vco applications in cycle mode or as common exponential control for both up and down times in slew mode

trigger input: used for envelope generation or retrigger in lfo/vco mode, a pulse at the trigger input will start the envelope or retrigger the lfo/vco

end output: turns high as the output falls below about 20mv, turns low as the outputs goes beyond about 3.5v, in cycle mode a rectangle signal is generated

cyle on/off switch: when "on" the end output is internally connected to the trigger input to generate cyclic signals like an lfo

output: the output of the slew limiter

led display: displays the slew limiter output signal



typical applications:
cycle switch = off, no trigger signal applied to trig socket: voltage controlled slew limiter or portamento generator: the signal applied to the signal input is "slewed". the slew up and down times are controlled manually by means of the up and down controls, the effect of the cv up and cv down control voltages are controlled by the cv up and cv down controls, in exponential mode these controls also affect the slew shape (see symbols at the ccw and cw positions of the controls)

cycle switch = off, trigger signal applied to trig socket, no input signal: envelope generator, the rise and fall times are controlled like the slew up/down times above

cycle switch = on, no trigger signal applied to trig socket, no input signal: voltage controlled lfo/vco, the rise and fall times of the waveform are controlled like the slew up/down times above)



this module requires 8 te/hp worth of space to fit in a eurorack frame.