I must say, I've tried to use my Motif XF as an arranger and I find it frustrating. If you program in Arp as a break or a fill, it is very difficult to get the timing correct by pressing let say; ARP 5 to fill, then press ARP 1 for the regular beat. It does not work as seamlessly as an arranger keyboard.
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Al

Pa4x - LD Systems Maui 28 - Mackie Thumps