Playing LH bass lines with RH playing full chords along to an electronic drum machine has been a popular acoustic piano playing style ever since the advent of the drum machine (1970's). It only makes logical sense for Yamaha to now finally join the other arranger kb manufacterers (Korg etc) by including FULL auto accomp (albeit muting bass & piano parts) to the mix which would allow you to play LH bass & RH chords, with further enhancement of auto accomp strings, horn/guitar fills, etc.

I hope Yamaha will seriously consider adding this feature on their NEXT arranger keyboard model.

Scott