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. This multifunctional module can be used as a VC Slew Limiter / VC Portamento / VC Low Pass Gate a well as an Envelope / Subharmonic Generator and a VCLFO/VCO. 

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, affected by the CV Up Control and the corresponding exp./lin. switch 
• CV Down Input, affected by the CV Down Control and the corresponding exp./lin. switch 
• CV Up and CV Down sockets are normalled