ALESIS FUSION
ANALOG SYNTHESIS TUTORIAL
The same is true of the filter envelope (if applied) - quite dramatic changes to the
sound can be
made with simple manipulation of the filter’s envelope parameters.
Here’s an example of a lowpass filter being swept by a decaying envelope:
At note-on, the envelope opens and so opens the filter allowing the sound to pass
through
unaffected. As the envelope decays,
it brings the filter cutoff frequency down and so the
upper harmonics are gradually filtered out and the sharp, harmonically rich square
wave
gradually becomes a sine wave with no harmonics over the course of the note.
Envelope generators - conclusion
That just about concludes our look at envelope generators for the moment.
On an original analog synth, this
is pretty much all you would need to know (in fact, on an
original analog synth, this is pretty much all there
is
to know!). However,
whilst the basic
principles still apply, a modern VA synth such as Fusion can offer so much more such
as
velocity (and other external) control of envelope times but to discuss
those here might only
serve to confuse the issue.
For
now, we’ll conclude by saying that the envelopes are typically responsible for ‘shaping’ a
sound’s tone and/or amplitude - so... get messing with those ADSR controls!!!
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