How To Acquire Video With Audio From Mic In?

[Barix]

I'm trying to acquire video from a webcam and a separate microphone connected to the soundcard (sblive), but virtualdub acquire the audio from the line in, and I can't find a way to change the source. I tried in the volume control applet, but changing the source in both play and recording controls doesn't changes the result ... there's a way to change the source directly in virtualdub??

Thanks all ..