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Thanks Mac, your explanation fits the facts exactly.

One final question - why does this not happen when I sum the stereo channels from the computer or the synth?

Tony




Well, it can, but those two outputs are far less likely to be intentionally making use of the kind of phase shifts that the stereo piano does. In the case of these piano patches, that amount of phase shift adds a realistic and "lively" sound to the tone, making it sound more like an acoustic piano when listened to from a close distance.

When playing out in front of an audience, you don;t really need that close-up sound to be all over the room, as that is not realistic either. The acoustic grand piano does the same thing as you move further away from it, the stereophonics of the thing, bass strings towards L ear, Treble towards R (for the player sitting behind the keyboard) becomes indefinable as to which ear within a very short distance.


--Mac