If you don't have one and just play Arranger I would grab an inexpensive DP to practice on and get your chops up. It will really help your Arranger playing. You can get a discontinued Casio Privia 160 for $399 now on blowout.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer