Well...if were going to split hairs here,then I suppose I could classify my Korg M3 as an arranger,since on certain programs and especially in the combi-mode,all I have to do is hit a single note and set off a pre-programed sequence.
M3 also has the Karma arpeggio function,so it really wouldn't require much on my part to create nearly an entire song using automation.

Yes the higher end arrangers have midi sequencing,but the dividing line between the workstation and the arranger,is that the arranger keyboards have an overabundance of auto-accompaniments and are just too damn expensive.

I personally don't care for arranger keyboards,because I prefer to write completely original music,by programming my own drum,bass,guitar, & synth tracks by hand,as I have been doing for the last 22 years.

If a musician is willing to be original & creative enough to build his/her own accompaniments by hand,then a workstation can do the same job as an arranger and for a lot less money.

-Elwood

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Korg M3,Reason 4,Presonus Studio One,Adam A7's,M-Audio CX5's & BX8a's,Zoom R24