Something doesn't make sense. AJ said a a/4-inch mono splitter that connects to a pair of 1/4-inch monos. If this is the case, then it's a single input--not dual. The mics would be wired in paralell, which means both would be using the same effects and volume control.

Now, if the adapter was a 1/4-inch stereo male (TRS) that split to a pair of 1/4-inch mono jacks, then you could plug in two mics and control each mic individually. I don't have a schematic of the keyboard, so I cannot determine how the circuit is wired.

Good Luck,

Gary

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Travlin' Easy