[LSR 2.20] broken: #785

[Thomas Morley]

http://lsr.di.unimi.it/LSR/Snippet?id=785
"Custom tuning and MIDI"
seems broken as well, due to the use of:
#(ly:load "define-note-names.scm")
returning
Unbound variable: define-session-public

No clue how to fix.
Hints?

Cheers,
  Harm