Crumar Musical Instruments User Group.

Matt,

Both problems you describe (last keyed priority fails to return with three
or more keys down, and
three note leap fails to jump octaves) are present in my Spirit as well, so
I would assume that you've
identified bugs or anomalies in the design.

I'm glad to hear that you're back up and running.

-alex
  -----Original Message-----
  From: mattn@... [mailto:mattn@...]On Behalf Of
Matt Nolan
  Sent: Wednesday, July 10, 2002 11:23 AM
  To: vintagesynthrepair@yahoogroups.com; crumar@yahoogroups.com
  Subject: [crumar] Re: Help with Crumar Spirit


  Update: Replacing IC5, a CMOS 4081 quad AND gate fixes the keyboard
  scanning problem.

  However, something is still not quite right. I think. The arpeggiator is
  as it always has been since I've had the Spirit - it seems to do just what
  it should except when you hold down 3 keys in "leap" mode - I get 3 notes
  arpeggiated, not the 9 I would expect. The octave jumping isn't working.
  Strange.

  The other thing, which I'm not sure is a fault or not, but I'm fairly sure
  it didn't used to behave like this. In regular (non arpeggio) operation,
  the last note keyed priority is a bit funny. If you hold 1 note and then
  add and take away a second, you get the second while it is pressed and it
  returns to the 1st when you release the second. Fine. But if you are
  holding 2 or more, toggling a 3rd doesn't return you to either of the
  first 2, the VCO stays with the last note. Is this how it is supposed to
  work?

  I've replaced practically all the digital ICs in there now, but only IC5
  made a difference. I need to get my hands on a 40174 and a 4517 to check
  ICs 6 and 7 though. If it's neither of those, then I'm off hunting caps,
  diodes and dry joints again...


  Regards,
  Matt Nolan.

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