Yamaha CS80

Ok, I finally put up an audio file of the CS80.  Look in the Files
section of the group for cs80_unison_mod.mp3.  It's a bad recording
(CS80 -> computer speakers -> Olympus voice recorder) and I was just
making stuff up, but it's there.  The file alternates between normal and
unison mode. The unison mode is louder since all 8 voices are playing,
but it's not much thicker.  It really needs a detune knob!  Toward the
end of the file I detuned the upper and lower, which does sound thicker
in unison mode.  One obvious thing is that the envelopes/triggering
works differently in unison mode. It's kind of a legato setting as you
can hear in some parts of the file.

 David

phaseshifter11 wrote:
> Hey David,
>
>  Any chance you might be able to post an audio file of what the unison sounds like? I 
> would love to hear it.
>
> And yes-it's way to hot here in Southern CA!!! My circuits are melting!
>
>
> Thanks,
>
> Stephen Teller
>
> --- In yamahacs80@yahoogroups.com, "David Rogoff" <david@...> wrote:
>   
>> Hi all.
>>
>> Hope it's cooler where you live than here (southern California)!  
>>
>> I have a mystery for everyone.  I just had a CS80 dropped off today
>> for a couple of (I hope) simple repairs.  It's SN 13-somethings and in
>> pretty good shape and tuning.  However, someone had previously
>> installed some kind of unison mod to it.  The current owner was told
>> that it used to (many years ago) belong to Frank Zappa (Jobson era???).
>>
>> I've opened it up a bit and taken a few pictures.  They're in the
>> Photos section of the Yahoo group in album "Unison Mod."  Does anyone
>> recognize this and/or know who did it?  It seems to work.  
>>
>> When the lower switch is set to "U", the keyboard is in a dynamic
>> unison mode.  Hitting one key stacks all 8 voices (sounds amazing!)
>> while hitting more keys starts splitting the voices.  Hitting
>> additional keys doesn't send new triggers to the EGs, so it's like a
>> legato mode.
>>
>> When the switch is set to "S" is seems to be in some kind of single
>> mode, in which new keys are assigned to upper or lower voice cards.
>> The upper switch somehow affects this assignment, but I haven't
>> figured out the algorithm yet.
>>
>> I haven't lifted the keyboard yet, but I'll post pictures of the
>> mystery circuit board soon.
>>
>> One thousand Quatloos to whomever can tell me about this thing.
>>
>>