Rivera Duo 212 100W Combo - UsedThe Hundred Duo Twelve from Rivera features two channels, each with push pull Ninja boost, and ranges from pristine clean to vintage high gain rock and metal tones. Each channel runs its own three band EQ, and a global presence control is also onboard. On the back panel is a parallel effects loop with send and return controls, internal external speaker outputs, and a footswitch out. This amp is in very good condition with general signs of regular use.