Pardon me, can't resist to tell you how a simple minded one
sees the problem:

Hammer rail is activated by the left pedal. Record it as
MIDI-controller 67. Now the synthesizer ( Kurzweil Micropiano )
does the job electronically or the piano does it mechanically.

In each case the loudness and harmonics will be lowered, when
the signal "hammerrail" arrives, accordingly.

Best regards, Horst Mohr¶
--¶
mohr@nemeter.dinoco.DE  H. Mohr Koelnerstr.49 51515 Kuerten 02268/1561