Unfortunately they are for some old version of Basic4PPC (I guess) with which 6.90 is not backwards compatible. So I did my best to transfer the guts of Piano4.sbp into a new 6.90 source, only to find that multiple Subs seem to be missing, without which I don't think the program is going to be useful. (E.g. drawboard and dibujaNotas. The latter suggests that it would be useful to speak a S European language!)
Pity, those programs look interesting...
Meanwhile I have discovered the shareware MIDI annotator and player "MidNote" and paid a modest $15 to purchase it.