OldSynths

I'm using every resource I can find to find help with or a solution 
for this problem. I apologize to any one who may be annoyed that I 
have posted this question in several groups. 

I bought a Paia OZ to fix up and have run across a big problem. The 
low d sharp is giving the same tone as the d key. When I
bought it the d sharp was only producing static when triggered. I
traced the problem to a faulty cd 4013 chip and replaced it. Now it
sounds a clear tone but the note is a d instead of a d sharp. I can't
figure out where the note value is generated and what I should adjust
or replace to fix it. I am still a novice to circuit design and could
really use some help on this one.

The schematics are here:

http://paia.com/oz.zip

I asked them first for help but they would not reply.

Thanks to anyone willing to help. I hope I can soon return such a
favor the the synth community.

Cheers

Jake Fish