David Nizaam `` Brownsound '' Baksh ( born 26 July , 1980 in Toronto , Ontario , Canada ) is a Canadian guitarist , singer and producer of Guyanese descent , best known as the former guitarist of successful pop punk band Sum 41 , but has since became a singer\/guitarist in his own heavy metal\/reggae project Brown Brigade . David Nizam `` Brownsound '' Baksh ( born 26 July 1980 in Ajax , Ontario , Canada ) is a Canadian guitarist , singer and producer of Indo-Guyanese descent , best known as the ex-lead guitarist of punk band Sum 41 , but has since became a singer\/guitarist in his own heavy metal\/reggae project Brown Brigade .