Recovery Class effects also state that Sonic Youth are using the "Dust to Burn" Overdrive pedal (a clone of the grey DOD 250 Overdrive from the 70's) not sure if that is just something used to record and/or tour with... an auction for the pedal:
http://cgi.ebay.com/VINTAGE-DOD-250-GREY-CLONE-DISTORTION-EFFECT-PEDAL-741_W0QQitemZ200433493795QQcmdZViewItemQQptZGuitar _Accessories?hash=item2eaac46723
also the Recovery Class seller is auctioning a "Emporer's Dirty Clothes" fuzz pedal.