Harley Benton Twoface

On the face of it getting both a tremolo and drive pedal for 59 Euro seems a bargain. Unfortunately this pedal has several problems that from the point of view of the user is somewhere between defects and features.
Tremolo: When increasing depth volumen decreases. There is a bias control which does not remedy this. However other tremoloes either has a make up volume or the same issue. If used as a tremolo-on-off pedal only this is a major problem.
Drive section: The Tone knop is basically a low pass filter and for acceptable tone should be places between 4-5 o'clock. Most of the pot's travel is not usable. Did the mount a linear instead of a logarithmic pot or vice versa ? Sorry, this pedal needs a redesign, especially when it comes to level balancing and utilization of full knob range.