Yamaha CS80

Some double triggers can be heard also on ORGAN presets played during a solo on "Curious Electric", on the same Jon and Vangelis' "Short Stories" album (1979) .
M
  ----- Original Message ----- 
  From: erikfromhere 
  To: yamahacs80@yahoogroups.com 
  Sent: Wednesday, May 21, 2008 10:05 PM
  Subject: [yamahacs80] Double trigger cure ? Was: Re: New file uploaded to yamahacs80)


  I can't participate in this interesting techtalk, but I think 
  Vangelis also experienced some double-triggering. At least, I think I 
  hear a double-triggered note on the track "I hear you now", Jon and 
  Vangelis. Have a listen at about 4:23 (time can differ a bit since I 
  listen to a mp3. Wow, even in mp3-quality you can hear it ;-) )

  --- In yamahacs80@yahoogroups.com, "dark_november2000" <jhaible@...> 
  wrote:
  >
  > Hi Scott and Group,
  > 
  > another thought about the double trigger issue.
  > 
  > If you prolong the trigger with a one-shot (what you described), 
  this 
  > should be a cure for _wrong_ notes to cause dissonance: you 
  ascertain 
  > that the trigger is long enough for the CV to reach its final 
  (right) 
  > value. But you'd still have two voices sounding instead of one 
  > (especially with a long release time or held damper pedal).
  > 
  > An alternative could be to mask the first part of the trigger, i.e 
  > only to allow it to reach the keyboard scanner electronics if it's 
  at 
  > least of some minimal length. (As long as it takes for the CV to be 
  > completely sampled.)
  > But this also means that *every* trigger would be delayed by that 
  > amount of time, which, depending on how much time we actually need, 
  > may affect the resposiveness of your playing. (Delays are always 
  bad 
  > for a good timing.)
  > 
  > So here is another idea:
  > 
  > For a trigger that's shorter than a certain time (let's say 50ms), 
  > the release time of the respective voice is decreased and/or the 
  > sustain pedal function is disabled for this voice. As everything is 
  > under voltage control inside a CS-80, this should be easy from an 
  > electronic point of view. (Don't know about the mechanical aspect, 
  > number of extra wires etc.)
  > 
  > Example: 
  > 
  > You have a voice with a release time of 2 seconds.
  > 
  > Now a bouncing key passes a trigger of 5ms to voice #1,
  > and a trigger of 200ms (as long as you hold the key) to voice #2.
  > 
  > Asuming voice #1 cannot build up its correct pitch CV in 5ms, you'd 
  > have a wrong note sustaining for 2 seconds without a correction.
  > 
  > Applying my idea (if it works, that is), both voice #1 and voice #2 
  > would have their Release time temorarily reduced to "zero" (a 
  couple 
  > of milliseconds) - but only for a tim espan of, say, 50ms after the 
  > trigger.
  > To voice #2 this would make no difference: as long as the key is 
  > held, the zeroed release parameter doesn't matter (we're not in th 
  > erelease phase yet!).
  > To voice #1 (the wrong one), it makes _all_ the difference: as soon 
  > as the glitch (double trigger event) is over, the voice goes off 
  > with "zero" release time (just a ghost note, where pitch perception 
  > isn't really possible anyway).
  > 
  > What do you think?
  > Could this work?
  > 
  > Best Regards,
  > 
  > JH.
  > 
  > 
  > 
  > 
  > > I tinkered with a corrective circuit, but am unsure if the 
  > correction 
  > > is 'better' (essentially a one-shot with a time of 50ms or so for 
  > each 
  > > trigger switch--16 in all).
  > > 
  > > Scott
  >



   

[Non-text portions of this message have been removed]