Auditory illusion

I have posted an old article (Loman & Fokker, 1947) about
the auditory illusion that a c-sharp can sound higher than
a d-flat on a piano.
It contains a few bars of music to demonstrate it:
http://www.xs4all.nl/~huygensf/doc/loman.html
I have added several MIDI-files with the same fragment in
different temperaments with C# above and below Db as contrast.
The article is in Dutch but if you can't read it, you can still
try the examples.

The interval list has been updated with Margo's new names:
http://www.xs4all.nl/~huygensf/doc/intervals.html

Manuel Op de Coul coul@ezh.nl