[I put up a Vaz Modular example of using Granular Synthesis
on the Amen Break at
http://avalon.net/~lucas/granamen.mp3 if you
want to hear an isolated example of what it sounds like]
Here is what granular synthesis is:
A sound is split up into a list of short segments, called grains.
Granular synthesis is the process of using this list of grains in various
ways to make new sounds.
Simple examples:
1. You can slow down a sound by repeating grains. Depending on
how slowly you do this, and how the grains are split up,
this can produce fairly natural sounding time stretching.
2. You can speed up a sound by sweeping through the grain list faster
than the natural rate for the sound. Go fast enough and you skip
grain's altogether.
This is in fact the basis for a lot of time stretching algorithms.
When you hear a loop radically slowed down on a record, that's a form of
granular synthesis. In particular, Sonic Foundry Acid uses granular
synthesis for it's real time time-stretching, and if you abuse it you'll
get some very autechre-ish sounds.
Other things you can do:
1. You can pitch the sound up or down by changing the playback rate of
the individual grains.
2. You can change the envelope (i.e. the amplitude curve) of the grains,
which amounts to adding amplitude modulation.
3. You can change the grain rate -- i.e. lower or raise the length of each
grain.
4. You can step through the grains either direction.
kent williams -- kent@avalon.net
http://www.mp3.com/chaircrusher -- tunes
http://www.live365.com/cgi-bin/directory.cgi?autostart=chaircrusher -- mix
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