Im looking at Orange Crush series and have found that the Crush10 has 'clean thru overdrive' whereas the Crush15 has 'Clean/Overdrive' and I was wondering what does this mean? Is it worth saving up the extra to get '/' instead of 'thru'? (I know there are other differences)

Warwick Jazzman
Hartke 1415 140Watt
Boss Overdrive