? diff morph/fade

[jh]

^>Could you describe these two in more detail? I can see that one must involve
>varying the relative slopes of the two sides of the triangle to get up or down
>ramps (MS10 LFO?), but what is the other method?
>
>Thanks a lot,
>
>Steve Cook.

The MS-10 and MS-20 increase the rate of one slope while decreasing
the rate of the other, keeping the overall period more or less constant.
(The MS-20 does a better job in terms of accuracy than the MS-10, btw:
Uses a pair of FET switches instead of diodes.)

The VCS-3 starts with a saw wave, and runs it thru a saw-to-triangle
converter (one-transistor full wave rectifier). A variable DC offset voltage
is fed into the converter, too. With zero offset, you get a triangle output.
With maximum positive or maximum negative offset, you get a normal
or inverted saw wave. In between, the saw is only partially "folded over",
so you get a triangle until some point where the voltage "jumps" a
certain step, and then goes on like a triangle again. Hard to describe -
you have to see it on the scope. *When* you see it on the scope,
you might not find it of much use, but the contrary is true. These
in-between settings are highly useful for certain FX sounds, the most
distinctive probably being the "breaking waves" sound known from
JMJ's Equinoxe (or Oxygene?), where you hear a very realistic 
surf-like noise sound. (I don't know if JMJ has done it that way, but
I can reproduce it pretty well on my Synthi Clone.)

BTW, I "heard" that the new MOTM VCLFO will have this special
waveform, too ...

JH.