Extended Karplus-Strong (EKS) Algorithm (Jaffe-Smith 1983)

$$\begin{eqnarray*} N &=& \mbox{pitch period ($2\times$\ string length) in samples... ...ac{1-R_L}{1 - R_L\,z^{-1}} = \mbox{dynamic-level lowpass filter} \end{eqnarray*}$$