Hi Sidney

> I also notice that the VCO doesn't make a tonal scale sound as I press notes from the keyboard. For example, if I press a C3 then a C4 on the keyboard I hear another interval instead of an octave. I kept the system turned on for more than 20 minutes as I read it needs some time to make it get in tune.

How do you connect the CV from the A190 with the VCO It should be the
CV1-Input!
All this sounds like the D/A converter is trimmed completely wrong.
Did you buy the System new, or is it a used system

Florian