Scott,
The way Ken's question was worded it appeared as if he wished to record a midi file on his PC, while at the same time recording an audio (.wav, etc.) file by plugging his mic into the keyboard and firing the vocals through the midi connection between the keyboard and PC's sound card. This, to my knowledge, is not possible because of the descrepencies in format. Power-Tracks is a great program, but unless something has drastically changed, it cannot simultaneously record a midi and .wav file.
Cheers,
Gary
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Travlin' Easy
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K+E=W (Knowledge Plus Experience = Wisdom.)