Don't really know if MTH proto sounds that are available for download can be used between the two versions. May want to substitute older proto 2.0 sound set for a Southern Crescent Imperial on order (3.0 version) if I'm not satisfied with whistle set. Heard many different types of whistle sets on the Southern Crescent, including one Imperial version which sounded horrendous....if my ordered one sounds like that, I would like to substitute it out....
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