Korg Poly800/EX800 Users

It's pretty well explained in Owner's Manual, pages 19-20, including  
some graphical examples.

So you are rather wrong when you think only setting of BP and Slope  
can change envelope. Setting of all parameters has impact on the  
resulting shape of the envelope. The interaction between BP and  
Sustain levels is essentially important:

If you set BP and Sustain to max, Decay and Slope will have no effect  
and you'll get three segment ASR envelope. Or even more simple two  
segment AS envelope when Release is set to zero. When even Attack will  
be set to zero, there's in fact no envelope - only switch on/off  
(trigger, organ type envelope).

If you set BP to max and Sustain less, Decay will have no effect.  
You'll get maximally four segment ADSR envelope where decay time will  
be set by Slope.

If you set BP and Sustain to the same level less then max,  Slope will  
have no effect.  You'll get maximally standard four segment ADSR  
envelope with that disadvantage that whenever you change Sustain  
level, you have to set BP to the same level.

If you set BP lower than Sustain, Slope will produce second Attack.  
Decay and Slope will control time in which second peak (set by Sustain  
level) will occur. It's possible for example to have no Attack time  
(quick start of sound) - Attack level is always max (that's not  
possible to change), then short Decay to zero (or other level) of BP,  
then no Slope time to get another quick attack to max (if Sustain is  
set to max). You can have maximally five segment envelope.

If you set Sustain lower than BP, Slope will produce second Decay.  
First and second Decay (set by Decay and Slope) can have different  
shape - this depends on times which you set and on the difference  
between BP and Sustain levels. You can have maximally five segment  
envelope.

And don't forget, that:

If Sustain is set to zero level, Release will work only before  
envelope reaches Sustain segment, and will continue from current level  
to zero.

If Breakpoint and Sustain are set to zero, Slope setting will have no  
effect, Release will work only before Decay rate will finish, and will  
continue from current level to zero.

And rate times change their absolute duration in accordance with  
difference between levels - the more difference between levels, the  
longer times of those envelope segments.

So easy it is :-)

Daniel Forro

P.S.: There's a mistake in Owner's manual, page 20, description of  
Release segment. "Sustain Rate" in the second sentence should be  
"Release Rate".



On Apr 30, 2012, at 12:43 AM, bimmerfan222 wrote:
>
> The thing on the P800 that drives me crazy is that Break Point &  
> Slope parameters for the EG.  It's kinda hard to get a visual cue on  
> how the shape changes as you change those two settings.
>
> -Blaine