Hi Sarge, we hire out A1s and they are a little difficult to set up for audio as they use the external XLR shoe, if the settings are not set or the inputs wrongly set you will end up with no sound or very little sound, I would imagine the audio settings on the shoe were not correct a common mistake is the settings for the type of mic powered or non powered etc.
You could boost the levels in the edit as a fix but this may not prove to great it all depends how much you captured in the first case.
If it helps here is our video camera hire pagesyou will find at the bottom many tips re audio they may help.
