To build on Mac's last point, this is critical when actually mixing recorded piano into a multi-track mix as well. I almost always force acoustic piano tracks to mono if I'm mixing the piano sound into a multi-track recording, because that's how it's heard to most people (other than the person playing the instrument).

I used to prefer a certain piano soundfont (Warren Trachtman's sampled steinway soundfont) over a much more delicious Akai (the Splendid soundfont to be exact) because the Trachtman font was recorded at a farther distance from the piano and had less 'artificial' panning built into the font. Didn't require forcing down to mono from stereo. Just some reverb and boom, that piano was in the room, not right in front of your face as if you were sitting at the keyboard.

Tony, please report back on what your fave CDs sound like auditioned directly into the Bose just like shown on Page 2 of the manual.

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