Bug report on Ubuntu 22.10 using latest kons-9 from this commit on main.
Setting alpha channel of color does not seem to change color of uv-mesh.
For example:

(set-point-colors-by-xyz *f* (lambda (p) (c-255! 107 217 104 0.2)))

Results in

Having fun with this so far thanks. I was looking to do some wavetable synthesis research using a variety of algorithms and was glad I could use common-lisp for the job! I appreciate the effort so far, perhaps I'll be able to contribute.