via this auction
"The MIDI interface is by JL COOPER. I tried to get a photo of the circuit board on the inside but it was just too blurry to read. According to the serial number plate, this was originally a 6 voice OB-Xa. It only has five circuit boards for voices now."
If you look at the second shot of the inside below you can see two voice boards sitting next to two blank spots. There is a second voice motherboard underneath.
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