Tascam Mixcast 4

This is an amazing piece of hardware from a lot of difference standpoints. I use it as the centre of my PC and music setup allowing me carry out many tasks from meetings to managing different audio sources (a mixer on steroids). I know this is not its intended purpose but its a very well engineered piece of hardware. The only issue i have is that you cannot stop the audio from a mic i/p being transmitted over the monitor out. This is probably due to the way I'm using it as I don't use the headphones