Which switch is that? Soft Clip? It seems to be only On and Off values. External? It seems to me only On and Out values.The switch corresponding to the external signal has three positions. The first disconnects this input from the mixer. The second position connects the output of the Mini V to the mixer. This allows, thanks to the particular distortion brought by the overload circuit, to obtain a typical sound. The third connects the external input to the mixer.
BTW, the Legato switch, in the left has 3 positions: On, Off and Glide. From UI perspective, a switch that screams On and Off on screen but have 3 alternatives is a total fail IMHO.
There's a way to use feedback (like in Monark) in Mini-V?