Envelopes (was: [A6] Ordered A6, patch sets and data card)

[Leary, John]

>> So why should a fast EGs automaticly mean it clicks?
>> Sounds like somthing that has become acceptable over time
>> but isn't inherently right.

> Afaik, the human ear percieves sound level changes as a 
> click if the change happens (too) fast.

That's not perception, it's the objective reality!  Even if you start at a
zero crossing, going instantly from flatline to a fullscale sine wave is
*exactly* equivalent to ring modulating said sine wave with a rectangular
wave.  New frequencies are generated, and have to be -- look at an FFT to
see 'em.  This is incontrovertible mathematics.

The slower the amplitude change, the lower in amplitude and frequency spread
the extra frequencies will be.  Different amplitude envelope shapes cause
different frequency profiles too.  DSP guys have a toolbox of such shapes,
known by names such as Hann, Hamming, Blackman, etc.

On the Andromeda, to minimize envelope click for a given rate, use the
horizontal S curve.  To maximize it, use the vertical S curve.