if you are wanting to record from the tascam (via one of the inputs on this tascam i presume):
connect it to a usb port.then open wavepad.then click tools>wavepad options.now in the options window click 'audio processing'.under 'sound play device',click the down arrow on the device tab.if you device is listed select it by clicking on it.then click ok.
you should,hopefully,be able to record from it.