On the incorporation of the chord looper.
I thought Yamaha (and users who wanted it it) may have been inspired by Ed Sheeran's use of a loop machine which performs a similar function.
He is one of the successful artists on the planet so, if this is the case, Yamaha were responding to the latest musical developments
and ,as such, I think were right to incorporate it in their keyboards.
As an aside though Ed himself announced at his last concert* he is not going to be using his loop machine any more!
The machine itself was the subject of some controversy when Ed used it at Glastonbury Festival.
As a national event many who were watching on television were not familiar with Ed and assumed he was using a backing track and were not best pleased!
I even had to explain it people the next day at work in London.
As another aside Ed comes from near my home town and has an executive box at my hometown football club. His last concert was at the park where I played as a youngster and was about 200 yards from my mothers house (who I just happened to visit that weekend!) so was a bit emotional.
Kelvin
PS I realise this post may be long and a bit rambling.
Apologies - blame the lockdown!