Casio CZ/ VZ/ FZ - Pro Series

Nathan your thoughts are good in theory but there are a few things that
complicate this in practice. The first is that at least my ears aren't
sensitive enough/fingers fast enough to measure the envelope changes with a
stop watch.  Maybe you might be able to get some kind of approximation but
I'm too deaf and slow to even come close. And the big issue is that you're
assuming that these rate/level relationships are linear and I'm pretty sure
that they're not (at least on most synths). That is the time represented by
a rate of  50 going from level 1 to 100 is not 5 times the time of a rate of
10 going from level 1 to 100. To make matters worse level 50 is probably not
5 times the volume(or whatever) of level 10. See what I mean? I know that in
the synth manuals they always draw the envelope diagrams with straight lines
but I believe that if you were to graph those values in real life all those
lines would be curves.

Jon   

	-----Original Message-----
	From:	Nathan I Smutz [SMTP:n.smutz@...]
	Sent:	Saturday, March 23, 2002 7:17 PM
	To:	CZsynth@yahoogroups.com
	Subject:	Re: [CZsynth] Digest Number 137

	Hello,
	
	The CZs envelope time depends on both the rate and the difference
between
	the levels.
	It is like throwing a ball.  The time depends on the speed you threw
it
	and the distance to the destination.
	The CZ manual says that if you were to draw the invelope, a Rate of
99
	would be representet by an angle of nearly 90 degrees.  And a rate
of 0
	would not change the level at all.  The line would be perfectly
	horizontal. (0 degrees).   
	
	Please correct me if I make any errors here:
	
	After some fact finding, you could use a calculator to find the
"Rate" or
	Time.
	
	
	You could use a stopwatch to find out how the rate numbers relate to
	Levels per second:
	
	For instance: You could measure how long it takes a sound to go from
full
	loudness (99) to silence (0) at a rate of 50.
	Divide the number of seconds (or fraction of a second) by 50 and you
will
	know how many Levels per second a rate number represents.
	
	______      --- Rate angle (50)
	             \                           99
	                \                           \
	                    \                         >Distance
	                       \                     /
	                          \                0
	                             \
	             |  <-Time->
	               
	
	You should take another measurement to confirm that the level
(volume)
	drops half as fast when the Rate is at 1.
	
	As soon as you know how many levels per second that the "Rate"
numbers
	represent, you can use a calculator to get the right "Rate" value
for the
	Time you want.
	Rate x Time =  Distance.   R x T = D
	
	The formula for Rate is: Distance (number of levels) / Time = Rate
D /
	T =R
	
	Divide the change in envlope "level" by the time (in seconds) that
you
	want.   The divide this number by the "levels pre second" numbe that
you
	determined with your stopwatch.
	
	
	Like I said: please let me know if my geometry is wrong on this.
	On digital syntheiszers: You might have some inconsistency in the
fastest
	rates and the lowest levels.  
	I hope this is of help.
	Make a joyful noise,
	Nathan
	
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