4053bigal

Hi there. Ive used my software a couple of times now. Im sending a signal to my mixing desk from the headphone connection on my laptop. Im having a big issue with the left mixer being a lot louder than the right mixer and also the mix is very tinny. Could anybody tell me what considerations I will need to consider to over come this. Are ther any settings either on the software or on my sound card which i could look at, thanks