We present a 5th-Order Wave Digital Filter datapath designed using behavioural synthesis tools developed as part of the SARI project at the University Of Edinburgh. We use a simulated annealing based optimisation system to develop the execution plan for the filter, with a datapath synthesised using clique partitioning and a novel heuristically driven module selection mechanism. These tools may be characterised by their ability to rapidly search the solution space for a given behavioural specification.