It plays VERY well on a keyboard with many keys, so you can play some really low notes that hangs for a very long time and then play some higher notes on top.
It uses around 25 percent dsp, so could probably update it with even more voices to get even more long hanging notes.
Think I need to do a little bit more work on it, but it’s a start 
This is a really fun synth patch, lots of great sounds in there. How is the KS implemented? I posted this one a while ago, but I remember it being very CPU intensive, maxed out at 4 voices
Signal path is:
Noise > Lopass > Env > delay.
And then a lopass filter in the delay feedback path too.
The KP is made using standard delread instead of delread4, it’s a bit cheaper.
To be able to play really high notes, i added a “block~ 1”, to make it proces on every sample, not only in standard block size 64. That makes it possible to play high notes.
I played around with it yesterday and I could squeeze around 15 voices out of it in a quick test, which used around 80% on Organelle. And that is only the karplus algo, there is no sequencer or effects either.
I just checked your patch quickly. I am thinking that the use of vd~ delay instead of delread~ might play a role. Also vcf~ filter might play a role a long with the biquad filters.
I just uses lop~, for filtering which is very cheap.
Yours seems overall a bit more sophisticated, so thats probably why it uses more DSP. But I still like the sound of mine though, especially when playing many notes, that’s what I wanted to do. I plan on tweaking it a bit more, though
Think I might try making iy with clone, which I have been using a lot lately. Very lovely object and the reason why I updated to OS 4.0 yesterday.
Overall liking 4.0 a lot!
The build in wifi and VNC server is very nice and was very easy to set up
That is great! It sounds really good and always fun in the low down octaves. Thanks for the details.