Korg Poly800/EX800 Users

On 14/07/12 20:41, k9k9dog wrote:

> so, what is the info on this? must i remove that board and
> somehow open up the switches and clean them? i'd like to sort
> this out before i attack the mod.

Just change them.  They cannot be satisfactorily cleaned up.
You do not want to be getting all those screws out more often than you 
have to.

> 2nd question/issue is something i have wondered about for a
> long time: the difference between the pulse wave and the saw:
> on my 800, the 'saw' sounds almost the same ('square-ish'),
> just louder. i wouldn't say either is distinctively square
> or saw...kinda in the square department more, and i'm not
> really hearing a distinctive 'saw/ramp'. is this normal?

The saw wave is generated by turning on all four octaves and setting the 
square/saw to saw - what it does is it makes each octave half the level 
of the one above.  You get a neat 4-bit digital sawtooth ;-)

> number 3 is: could somehow explain, or do a sketch for me,
> of wha exactly the envelope terms 'slope' and 'breakpoint'
> mean?(ok, so i was mucking around with it with the VCF EG
> inverted, and that didn't help clarify much- again, the default
> noise patch)...pathetic, really, when i've had this thing for???
> well over 15 years.

You've got ADSR on a normal synth, right?  In the Attack phase, the 
envelope builds up until it reaches maximum, then flips to Decay phase 
where it drops until it hits the Sustain level, and of course the 
Release time on key-off.
Well for ADBSSR, the Attack and Decay phases are the same, but Decay 
will hit the Breakpoint and then decay at a different rate set by Slope, 
until it hits the Sustain level.

-- 
Gordonjcp MM0YEQ