Crumar Musical Instruments User Group.

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.