Control signal generating apparatus generates a first plurality of output signals from a second plurality of input signals. For each output signal, a locus generator defines a sequence of combinations of values corresponding to the input signals forming a line-like locus in the space defined by the input signals. For each locus generator, there is a distance value signal calculator for evaluating an output signal having a value determined by the distance in the space of the point, that is, the cursor point, represented by the combination of input signal values relative to the locus. The distance value is the distance along the locus corresponding to the projection of the point onto the locus.