New British Pedal Company Compact Series MKI Tone Bender Fuzz Guitar Effects Pedal RC-505mkII You can use the Caiman

You can use the Caiman Tail Loop it either Program mode or Direct mode

allowing BOSS to equip the ME-80 with a generous array of foot-operated controls while keeping the unit extremely compact and mobile

minimum 300mA

four-knob interface makes it easy to dial in sophisticated results

From Boss:

New British Pedal Company Compact Series MKI Tone Bender Fuzz Guitar Effects Pedal RC-505mkII You can use the CaimanCompact version of the 1965 pedal originally developed by effects wizard Gary Hurst. The MKI Tone Bender became the main tone for artists such as Jeff Beck, Mick Ronson, and many more. This pedal was the founding father of British fuzz. BPC Compact Series MKI Tone Bender Small casing variant MKI Tone Bender circuit Handmade in the UK Germanium PNP transistors Level & Attack controls Negative 9V DC power inlet