Vintage Synth Repair

Phil, thanks once again for your help. I really had no idea.

Seems the power supply is ok as all the checkpoints read ok.
The other day when both the load and transpose leds lit up with sound 
coming out the unit was I guess due to cpu pin 40 being slightly 
shorter than the others, failing continuity test! Vintage Planet 
mention something like this in their spare parts list, btw. After 
fixing it with a bit of wire, the unit went back to the original 
problem: just the transpose led stuck, with no sound.

Nik,

One thing noted: nearly all the pins going from the cpu to the 4050 
chip read 5v dc. Is it "digital information"? I get the same reading on 
all the 4050 outputs, going into ic 9a. 4050 datasheet seems to mention 
this chip should output only 0,5v (but I could be wrong)...

Is this a sign of a fried chip? I have no other clue.

Many thanks.