Unfortunatly I think the manufactures aim Arrangers mostly at the home market and put in sounds, onboard speakers and such to sell to them. Plug in the AC cord and play. Just like the home organs of the 60's and 70's. We just use them as professional tools.
A TOP module would be the answer and I would love it but it would probably scare away most of the home buyers because it would be "Too complicated" to hook up a midi cable, no less an outboard sound system.
Bill in NJ
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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