Hi Ed,

The module that you need to do portamento is the Q105 Slew limiter. This module creates portamento or glisando.

For PWM or Pulse width modualtion just slect the Pluse wave on the VCO and run it through the Slew Limiter and it should work. Though this is second guessing on my part since I am still learing about analog synthesis and analog synthesizers.

Paul