Calvin answered a tweed by DJ White Pepper regarding what he used to record the guitar for 'Outside'. He tweeted back with [This Photo](https://pbs.twimg.com/media/B5pe3o-CYAAnhcz.jpg) of his sansamp classic. He also used a Gibson SG Custom.
Replaced Kurt's Boss DS-2 in the Utero tour, despite popular belief that it was a secondary distortion pedal. According to kurtsequipment.com, "This pedal was certainly NOT used on Nevermind, like some magazines claim. "
In this [archived article](https://web.archive.org/web/20040213203727/http://archive.guitarplayer.com/archive/artists/thecure.shtml) from *Guitar World* magazine's April 2000 issue, the SansAmp Classic is listed in the sidebar as being one of Robert's effects.