It's very rare that you can correct audio problems with software.
It sounds like you are trying to put "line" level audio into a microphone level input.
I don't know the eqipment you're using but try to change the output at the venue to "mic" or the input on your camcorder to "line" or use the "line" socket on your camcorder, if there is one.
You need to end up with both input and output at the same level, preferably "line".

Failing that you might have to use a "pad" which reduces the line level to mic level.