Ok.. so on my marshall with each channel having Bass, Mid, Treb, Gain, Volume... and then there being on overall volume knob.. what part is pre and wot is power?

Also... what are the implications of the channel volume being at 10 and overall volume at one.. compared with channel volume at 0ne and overall at 10?

Im after a slash tone and need as much distortion as possible, so what settings would you recomend?