Analog - VLE and VPF filters - Booster - XLR DI output -True Bypass CONTROLS LEVEL BOOST (level knob and on/off switch) VLE (Vintage Loudspeaker Emulator) VPF (Variable Pre-shape Filter) Filters on/off switch REAR PANEL INPUT jack OUTPUT jack XLR active DI output jack GROUND LIFT POWER jack (DC 12V)