A few weeks ago, my friend and I installed a new Pianomation II
system into a 130-year-old piano.  Due to the pianos age it was
impossible to tune the piano to 440 Hz; instead, we could tune it
to only 425 Hz without having to buy new strings.  Now we run into
the following problem:

QRS piano MIDI-data often has additional instruments added that play
at 440 Hz and sound horrible when accompanied with a piano tuned to
425 Hz.  Has anyone invented anything to solve this problem, or is
the only solution to buy new strings?

Thanks for any ideas,
Fredy Gerer