I'm totally new to viynl and i'm having some problems which I need some help with. There is a wierd mix discrepancy between the left and right channels. By that I mean that the volume of the parts of music which come out of the left channel (i.e. guitar overdubs) are the correct volume BUT hardly any instruments are coming through the left channel. So basically for a typical guitar band song at the moment I'm hearing all the main vocals, bass guitar, guitar and drums coming from the right channel and only the occational overdubbed guitar or backing vocal coming from the left. These are proper recordings and no engineer in their right mind would have mixed these albums so c**p, so there must be something wrong with my system. Any help would be greatly appreciated.