One should really let one's ears judge these things. The special quality of sine waves at least
to me is one shouldn't be hearing any harmonics at all. If you do then it's "almost a sine" or a
distorted sine, or something but not a sine. Unfortunately I heard that way back in the 1990s
with my A-110s and do think it's a legitimate criticism. Will I stop using my A-110 modules
No, they are compact, inexpensive and useful for a lot of things, just not clear sine waves if
that's what I want.

One thing I can add is sometimes VCOs that aren't even close to textbook can be very
special. The early Korg VCOs on units like the 700 and 800 I've seen have some really
"incorrect" shaped waves but sound exceptional, if cloned I'd definitely want some, but just
the opposite is true too. I have to say that CEM waveforms in general seem pretty good
visually and are certainly not terrible sounding though I have to say I've heard much better
sounding basic waves, especially in the very high and low ranges.

I picked up a Z3000 because it seemed kind of interesting and I happened to have had the
money on hand. I think it's working okay now but I had a lot of trouble initially. I had it next
to a Plan B Model and it wasn't happy at all power-wise. Maybe my case is underpowered.
Anyway the display was crashing and generally not working. It did seem to work eventually.