Ok gang, I am about to ruin your Evolver.

I read this post:
http://www.vintagesynth.com/forum/viewtopic.php?f=1&t=49602&start=0&hilit=dco+po\
p

...and I said, "No this is ridiculous, I have had an Evolver for 4+ years. I've
never heard this."

So I got home, dialed up a simple patch. It's true, it's there, and now that
I've heard it, I can't STOP hearing it.

To repro:
Create a simple patch using the ANALOG oscillators - one or two. Make sure the
envelopes have short attacks.

Play enough low notes that you cycle all the voices your evolver setup has on
the low note - one note should be sufficient for standard MONO setups, 4 for
standard POLYs. So, tap a low C 1-4 times.

Now start to tap some high notes - an octave or two above middle C.

Listen. What you will hear is that each voice that transitions from a low note
to a high note will produce an audible "clopping" - a wide-frequency
glitch/click as each voice goes from the low note to the high note.

Apparently it can't be fixed.

The digital oscillators don't have this issue.