proto2000 F-M H10-44 sound

hi to any owners of proto H10-44 w/sound. i am going to purchase one shortly, and i was wondering just how good the sound quality is with regards to copying the sound of the F-M opposed piston engine. from what i’ve heard, that was kind of a quiet? engine, therefore used in subs in WW11. [not that few of us have actually heard this prime mover in real life]. any opinions? thanks, michael r.

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