Abstract: A control system for a variable input device 2 having a slider 14 has a box 1 housing a trigger 3 capable of moving in translation between two positions relative to the box. One of the two positions constitutes a rest position. Springs 13 apply a resilient force to the trigger to urge it towards the rest position. A coupling element 45 couples the trigger with the slider 14. A foot lever 9 is mounted for rotation relative to the box about a first horizontal axis 17. The rotary motion of the lever is translated into translation motion of the trigger by a sliding block 31 mounted within the box so as to move in translation relative to the box. One end 37 of the sliding block comes into contact with the trigger. A translation control device 10 controls the extent of translation motion of the sliding block 31.