We recently had a three camera dvcam shoot. It was a live edit recorded onto a dsr-45. We recorded 4 channels of audio, however I can only seem to import channels 1 and 2.
SCLive will let you capture all 4 channels from memory.
Or else in the DSR-45 you can select which channels get captured but that means capturing twice and then syncing it up, PIA.
Bear in mind though that 4 channels in DV = 32K / 12 bit, hope your record levels were good.