? diff morph/fade

[Thomas Hudson]

A good simple example of the differences can be seen
when you consider morphing between a ramp and reverse 
ramp. The exact middle position would be a triangle
wave, but you would not get this with cross-fading.
Take a look at 

http://www.cygnus.com/~thudson/wave/test.html
(java required)

Move the second slider all the way to the bottom
to sharpen the waveform, and then use the third 
slider to morph between ramp, triangle, and reverse
ramp.

Of course, their are many different ways to implement
morphing, Eric Sheirer has done some work using analysis
of beats, see 

http://sound.media.mit.edu/people/eds/beat/morphing.html

The Emu UltraProteus and Morpheus can morph between filter
responses using "14 Pole Z Plane Filters", which I think
is just a marketing term for using a number of parametric
filters to implement various filter responses.

One could argue that audio morphing is all about finding
new and interesting ways to get from A to B. Crossfading
being the one we all know well enough to find uninteresting.
Or it may be uninteresting because no new components are
created in the middle regions.

Thomas