# Barton/AO 4046 VC Wave Shaper **URL:** \ **Category:** KOSMO MODULES\ **Created:** [November 28, 2021, 8:59pm UTC](https://lookmumnocomputer.discourse.group/t/barton-ao-4046-vc-wave-shaper/4294 "2021-11-28T20:59:01Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)\ **Post date:** [November 30, 2021, 9:43am UTC](https://lookmumnocomputer.discourse.group/t/barton-ao-4046-vc-wave-shaper/4294/6 "2021-11-30T09:43:20Z")
> [@analogoutput](#): > > That’s the ‘waveform’! The signal looks like it is being chopped. Is this because of how you implemented the VCA (using a 4066 as an attenuator by pwm of the switching frequency) ? The switching frequency should be high enough not to be audible (and visible given the time scale of the plot I expect, but I’m not sure), or else you get an effect similar to [a ring modulator](https://lookmumnocomputer.discourse.group/t/pwm-fader-experiment/3474). Do you filter out the VCA chopping frequency from the output signal or don’t you have any dogs in your neighbourhood ? --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/barton-ao-4046-vc-wave-shaper/4294)._