Add a low pass gate anywhere in any patch, seriously, just plug it in and go. This tiny gate eliminates the need for extra patch cables or a separate module, simply add it to any pre existing patch.

Middle input is for control voltage, this opens and closes the VCA which leads into the low pass filter. Knob controls the low pass filter, clockwise opens the filter and counterclockwise closes it. Because this is passive, fully closing the filter will cut high frequencies and drop volume slightly. When filter is fully open, it becomes a regular VCA with no filtering.

These are all made to order by hand, each VCA contains a DIY optocoupler.

Demo available here!

https://www.youtube.com/watch?v=fnQR2uWmmXY&t=192s

Stand-alone low pass filter available here:

https://etsy.me/3HNvORz