The Div Remainder block takes two control inputs and writes the remainder of the first divided by the second to a control output. This is the floating-point modulo (fmod): the amount left over after control input 1 is divided by control input 2 as many whole times as possible, keeping the sign of the first input. It is a control-domain math operator with no adjustable parameters.
On every tick it reads both control values, applies the standard-library fmod function and stores the remainder on the output control pin. It holds no state and processes one sample-frame per tick, in step with WaveWarp's sample-per-sample engine.