I think you can find some real nice accordion patches on certain keyboards. Here is an example of an accordion patch on my Fantom G7..

Paris in the Summertime

Doesn't quite compare to the real thing but - Ooh La La!! Not too bad for a keyboard in my humble opinion.

All the best,
Mike
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Yamaha Genos, Mackie HR824 MKII Studio Monitors, Mackie 1202 VLZ Pro Mixer (made in USA), Cakewalk Sonar Platinum, Shure SM58 vocal mic.