Ian,

Onboard speakers usually have a detrimental effect when you are using vocal harmonizers--even with a quality, unidirectional mic. A good example of this was clearly demonstrated on the PSR-Tutorial site. Of course, if you don't sing, especially in harmony, then it's not a problem.

Cheers,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)