certain mixing guys can trash your band if you let them have too much influence within a working band on the road ,I don`t mean sound wise but they can poison a good working vibe because of their opinions of what sounds good and can influence weak minded members causing fall outs and then the inevitable . and the closely related studio versions can be the same ,they think they re in charge ,I must stress that not all are like this ,some are great and you would love them to be part of whatever you do ,just remember what came first, the chicken or the takeaway sandwich.