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.
Mid Boost Mod
Stock pedal vs Keeley type mod
Overtone Labs vs Keeley vs stock Boss
Marshall JCM style mods
Minke Mod
Keeley vs Analogman
As you can hear, the well known guitar effect pedal can be changed to an quite unique distorted tone maker.
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