A fade device (100C; 200D) comprising: a crossfader and mixer interconnected via a processor (120; 130); a crossfader slider control for generating slider signals indicative of slider positions; a rotary control connected to the processor; a first direction of rotary control movement for creating a delayed slider position signal; a second direction of rotary control movement for creating a predicted future slider position signal; the mixer (104; 104a) being configured to receive a first audio input , a second audio input , and one of a) the delayed slider position signal or b) the predicted future slider position signal, and combine an audio signal derived from the first audio input and an audio signal derived from the second audio input to provide a mixer output; wherein the gain of at least one of the derived signals is controlled by the delayed slider position signal or the predicted future slider position signal; characterized by : a processor main motion buffer for indicating a sequence of actual slider positions and the times therebetween; and the processor being configured to: create a delayed recording of the actual slider position versus time in a delayed slider position buffer to provide the delayed slider position signal; and create a prediction of slider position based on third derivatives of actual slider position versus time to provide the predicted future slider position signal. a crossfader and mixer interconnected via a processor (120; 130); a crossfader slider control for generating slider signals indicative of slider positions; a rotary control connected to the processor; a first direction of rotary control movement for creating a delayed slider position signal; a second direction of rotary control movement for creating a predicted future slider position signal; the mixer (104; 104a) being configured to receive a first audio input , a second audio input , and one of a) the delayed slider position signal or b) the predicted future slider position signal, and combine an audio signal derived from the first audio input and an audio signal derived from the second audio input to provide a mixer output; wherein the gain of at least one of the derived signals is controlled by the delayed slider position signal or the predicted future slider position signal; characterized by : a processor main motion buffer for indicating a sequence of actual slider positions and the times therebetween; and the processor being configured to: create a delayed recording of the actual slider position versus time in a delayed slider position buffer to provide the delayed slider position signal; and create a prediction of slider position based on third derivatives of actual slider position versus time to provide the predicted future slider position signal. a processor main motion buffer for indicating a sequence of actual slider positions and the times therebetween; and the processor being configured to: create a delayed recording of the actual slider position versus time in a delayed slider position buffer to provide the delayed slider position signal; and create a prediction of slider position based on third derivatives of actual slider position versus time to provide the predicted future slider position signal. create a delayed recording of the actual slider position versus time in a delayed slider position buffer to provide the delayed slider position signal; and create a prediction of slider position based on third derivatives of actual slider position versus time to provide the predicted future slider position signal. <EOS>