I have a question regarding operation of one function on Yamaha (and other) keyboards.

On my Roland G1000 I am able to split the keyboard and play the left hand voices together with my arranger accompaniment - this helps me "funk up" the accompaniment with pseudo-manual bass (slap-bass or very bright piano works great). This is different from Manual Bass, which mutes the accompaniment's bass line altogether.

In my short experience with Tyros and PSR2000 (trying it in the store for 15 minutes) I was left with the impression that I could not have the arranger's accompaniment and the left hand voice playing together. Is it true?

How does this work on other keyboards (Ketron, Technics, Korg, others?)

Thank you in advance,
Alex