I have never experienced this type of phase cancellation,
-dj
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Yes, this is a well-known phenomenon, especially with stereo piano samples, which the Nord grand pianos and uprights all are. Incidentally, the electric pianos are all sampled mono, so it doesn't matter.
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Hi, the Electro 6 has a MONO function (shift + KBD TOUCH) which does a great job on the FX as well.
Two inputs into an amp with two inputs will be just fine, as there's usually a small mixer embedded there. A backwards wired cable will invert phase and almost completely cancel your sound. You won't know which one is backwards until you try to use both of them!
I prefer mono for small, intimate venues (think duo/trio).
I think I have gear issues ....