Hi Mike
Thx for replying; actually I can have two references, one is
Fernando's machine, the other is a 60: to be honest I didn't realise
such a flaw until you mentioned it, I did really thought it was due to
poor tuning in the first place, so I'd like to go deeper into it; btw,
does the pitch drift randomly go from voice to voice (e.g., play low
then high note, does the pitch drift to high?) or does it follow
anything near to a logic like on the glissando?
Also, could the bug
originate from the idle/busy state in the KAS' FIFO shift register? As
it is a fake poly assigner could the KAS get wrong messages perhaps?
Let me know, I can't wait for further infos!
:-)
M
----Messaggio
originale----
Da:
mborish_2000@...Data: 25-lug-2011 7.49 AM
A:
<
yamahacs80@yahoogroups.com>
Ogg: [yamahacs80] Re: KAS bug examples
I'm planning on putting all of the troubleshooting results on my own
website in the near future because I need full HTML to reference
pictures, audio, and maybe some math. I need a better scope to catch
everything related to the bugs on my CS-80 even though I already know
temporary solutions for both of them. I can't really justify or afford
an amazing deep memory scope until at least sometime next month and I
still might not do it because, well, it's gonna cost at least a few
thousand US $.
The two bugs that I'm going to take a crack at when I
make some posts on my website are the SH pitch drop or raise in Sustain
I bug and the Volt/Oct Scaling bug. The SH pitch drop or raise slowly
changes the pitch of your release tails when you have the sustain set
high. The Volt/Oct Scaling bug doesn't quite scale the YM26700
properly when pin 12 spits out the octave data...I think; this is what
I need better test equipment for. Like I said in the previous post,
when you hold down one key and then play another in a different octave,
you can hear the held down key jump a few hertz.
I'm assuming that you
and Fernando have run into the same octave scaling problem? If so,
please describe your problems as well as your theory related to the
problem. A temporary fix is to slow down the Master Clock by replacing
the 100pf cap in the oscillator loop with a 180pf cap. I'm not going
say why I think it works yet because all I have is a theory without the
proper test equipment. This will slow your clock down to about 70K and
also clears up about half of the double triggering. Yes, it slows down
the key trigger time slightly which seems like a bad idea at first,
but, honestly, my whole machine feels more stable and most of the
double triggering is gone.
My machine is now tolerable but not quite
right after the clock mod. The held down bass key went from about a 4
hertz drift on octave changes in a higher register to about 3/4 hertz
drift.
Sorry, but I've been busy and haven't had the time to mess
with my CS-80 or get further with these issues.
-Mike
--- In
yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@...> wrote:
>
> Hi
again
> This is for Mike: have you managed to record any example of the
supposed KAS' bug?
> Let me know!
> M
>
> [Non-text portions of this
message have been removed]
>