I believe Joe Water's PSR site has free software for this purpose but it's been awhile. Somebody mentioned Bedesem and I believe he may be the "author" of the program.
Dave & Deane, yes, my memory as well vaguely recalls a free software was available at one time on the PSR Tutorial and/or Jorgen's site that supported display of a Yam style's keyboard source, but in addtion to Beakybird's confirmation, both Michael & Jorgen say none of 'their' programs include that specific feature.
If they are factory ROM styles, perhaps some old manual
No, these are Tyros2 era and earlier '3rd party' produced custom styles.
EMC Styleworks will show model format.
Fran, wow, I do now recall it might have been StyleWorks Universal that I remember displaying this info so will have to re-install it on my PC and give it a go. Thanks.