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Boss DS-1 is a kind of constructions, where many parts can be changed, and many circuits can be modified. This is why there's so many modded „orange boxes” on the market.

Some mods are just making the pedal a little bit warmer, colder or boosting more middle frequencies. Some of them makes a new kind of guitar effect stomp-box from the stock DS-1. 

Here are some good demos from YouTube, which can show you, what MOD really means.