Youre wrong Tex.
If you know which frames of audio you want to strip, slide the pointer at the bottom of the main vdub window to this frame, then at the top left select edit, set selection start & then slide forwards to where you want it to end & click: edit, set selection end & then go to file, save, direct stream copy & save that video clip. Then load it back into vdub & strip the audio off.
Easier than it sounds.