Maestro Rhythm King MRK-4 Effects Pedal All faders and sliders are

All faders and sliders are present

Hawk Echo and Yocto 8080

Tube FX Loop with series/parallel switch (especially useful when used with amps with no effects loop or series only)

The end cheeks are also very clean with minimal signs if age

it is theoretically the 70s Powerboost with a master volume added and rehoused in a grey hammerite case

Maestro Rhythm King MRK-4 Effects Pedal All faders and sliders areUncommon beatbox which features the superb and unique modulation section which allows you to groove an external signal (e. g. guitar, synth etc) using the on board rhythms. This is stunningly effective and a great creative tool.