Thanks Mac,

Yes, the previously recorded track plays back just fine if you hit the play button in RB. When hitting Record we do not hear that previously recorded track, but we can record fine on the empty track.

I've checked for a duplex option on the sound driver in WinXP for this "sound card" and do not see it, so I'm suspecting that the sound card and/or driver is the limiting factor here.

Does anyone have a good suggestion for an add on sound "card" you are using that supports full duplex operation?

Burt