Here’s my take on a portamento/glide. I found a couple of layouts in the past that didn’t track super well for various reasons on VCOs so I designed and built this one.
If you want more glide, upsize the capacitor.
I’ve added a 1M pulldown on the input as I found it flew off into space if unplugged (of course) and this doesn’t appear to noticeably put my VCOs out of pitch for their 1v/oct feed.
Nice and simple but super important for grindy sliding bass!