One thing that needs to be thrown in to the mix is the difference between the way traditional players use arrangers and the way younger players use arps/styles/loops.
Traditional players are more passive in that they just want to play songs that have already been made. Contemporary players are more creative and active players and want to make their own songs and not necessarily play what is already there.
I am sure Yamaha and Korg are testing the “young person arranger market” with some style functions in their Motif xs and M3 offerings.
If they get feedback with players saying that they want more ways of controlling the arpts/loops live, then maybe they would consider putting more “live style features” on their. But with out that, there would be no incentive for them to do that.
Remember the whole purpose of an arranger is to sound like a band. An arranger is there to substitute for a live band.
Is contemporary hip-hop and R and B being performed by live bands?
Not really, most of the contemporary hip-hop and R and B are performed in clubs and other establishments by a DJ. When it comes to contemporary music, could an arranger replace a DJ.
And for those who do not understand the chicken and egg scenario, it is the question of which one comes first. So for example, do you need the egg first so that the egg can hatch in to a chicken? But how can you get an egg without having a chicken (chicken lay eggs). But there can not be chickens unless they came from eggs. And you see how you could just go in circles continuing with the thought process.
Asking arranger manufacturers to make styles for a market that is not there (hip-hop and r and b) is like asking Workstation manufacturers to make more big-band and swing ARPS/Loops where there is no market for that.
The fact is there is no quantifiable proof that contemporary hip-hop and R and B styles are wanted on an arranger.
Workstations are covering that very well.
P.S if one really wanted to play hip-hop and R and B live on the Yamaha motif XS, while it may not be the same operation as a fully functioning arranger with styles, but you could do it with patton and patton chaining and the performance mode.
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TTG