Dip switch options, A settings, B settings – Sound Devices USBPre 2 User Manual
Page 8: Usbpre 2 user guide and technical information 7, Low-cut filter (7 and 8), Limiter (5 and 6), 15 db pad (3 and 4), Dual mono (1), Balanced output level (1 and 2), Hp mono function (3)