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Audacity may have some filter effects that will do the trick, http://audacity.sourceforge.net/. Some subtle use of echo would be the place to start.

You would need a recording of a piano to begin with which could be from a MIDI recording. I haven't used any but there is a good list here: http://en.wikipedia.org/wiki/List_of_MIDI_editors_and_sequen...

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Yeah Audacity seems to follow the traditional reverb and digital effects route. You choose a few parameters (frequency modulation, amount / time of delay) and a generic "room" is available to pass a sound signal through. There may be a way of getting more fine-grained with the inputs to exactly simulate a specific room, but this is not evident to me from looking at the docs.

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