[sdiy] arp odyssey unusual bug - fixed

[leaf at babble.vibrant.org]

Wow.  this turned out to be quite a sneaky bug.  It wasn't the
voltage memory, it wasn't the keyboard control section, and it was friggin
near impossible to reproduce in a consistant fashion.

Turns out the cv-in jack was no longer consistantly making contact, so it
was cutting out the cv from the keyboard, hence the pitch not changing.
Furthermore, there were some magnetized iron shavings that had stuck to
the cv-out jack, and so playing keys would sometimes close the circuit.

One cv-jack later and my odyssey is better than ever!

cheers
Phil



On Mon, 5 Nov 2001 leaf at babble.vibrant.org wrote:

> hello,
> 
> my arp is behaving in quite a curious way - when i play a note, i get the
> same pitch for almost all keys.  
> 
> if i play a low note, i get the proper pitch, and can then play roughly
> the lower half of the keyboard correctly, until the note gets stuck again,
> at which point only the bottom note or two will unstick it.
> 
> Even weirder: if i play two notes at a time once it's stuck, it will
> continue playing the stuck note pitch, but the second note will be at the
> proper interval away from the first pitch - ie the proper pitch isn't
> respected but the difference between the two notes is still determined
> properly.
> 
> What is going on here?  I checked the keys and none of the j-wires are
> stuck.  Is it possible that the cv memory is latching up?  Any ideas are
> greatly appreciated, I love this synth - it's one of the rare ones with
> the moog filter =-)
> 
> cheers
> Phil
> 
>