The AMP MODE circuit is based on a MOSFET transistor which is a very popular type of transistor to use for boost circuits because it has many “amp like” characteristics when it clips etc. There can be downsides to this circuit though.
Several very popular MOSFET boost circuits on the market have a very noticeable crackle when their boost knobs are rotated. They fixed this issue in the AMP MODE so it is perfectly silent when the boost knob is rotated and delivers nothing but a crushingly loud and harmonically rich boost!
Use the AMP MODE as a preamp for your overall signal, a boost to push an overdrive pedal even further into saturation, or as a post overdrive boost to clarify and push your guitar forward in the mix! The AMP MODE features 9-18V operation, true bypass switching and a tiny footprint featuring top mounted jacks!