Hi there Jerry
I've just checked my SI Electric Piano and I'm missing that 'CHORDS' options too. That's really weird. I know I used to have it somewhere along the line as I've used the feature once or twice. I wonder if others can check this, or if it's a known problem?
I've only got 8.5.3 and X1 Expanded on my PC at the moment, and the 'chords' catergory is missing in both versions, in 64 bit and 32 bit flavours.
Here's where the option should appear:
And here's what mine looks like:
It will be interesting to find out why this is happening, and how to put it right.