CS is not an audio function! no audio looping station on bk-9
I had the impression too that description is not clear, but do no doubt,
CS is reintroduced from G1000
audio functionalities are relative to Audio Key function and wav recorder (same as BK series)
The convenient Chord Loop feature instantly captures rhythm backings as WAV audio loops, and also makes it simple to build chord sequences from rhythms to use for composing in the sequencer.
That's straight from the Connect page. Hard to confuse that.